diff --git a/autotests/solver_format.cpp b/autotests/solver_format.cpp
--- a/autotests/solver_format.cpp
+++ b/autotests/solver_format.cpp
@@ -51,10 +51,10 @@
 
 static DealerScene *getDealer( int wanted_game )
 {
-    fprintf(stderr, "diuuuuu=\n");
+    qCDebug(KPAT_LOG, "diuuuuu=\n");
     foreach ( DealerInfo * di, DealerInfoList::self()->games() )
     {
-        fprintf(stderr, "di=%p\n", di);
+        qCDebug(KPAT_LOG, "di=%p\n", di);
         if ( di->providesId( wanted_game ) )
         {
             DealerScene * d = di->createGame();
diff --git a/dealer.cpp b/dealer.cpp
--- a/dealer.cpp
+++ b/dealer.cpp
@@ -770,10 +770,10 @@
 
 #ifndef NDEBUG
         if ( m.totype == O_Type )
-            fprintf( stderr, "move from %d out (at %d) Prio: %d\n", m.from,
+            qCDebug(KPAT_LOG, "move from %d out (at %d) Prio: %d\n", m.from,
                      m.turn_index, m.pri );
         else
-            fprintf( stderr, "move from %d to %d (%d) Prio: %d\n", m.from, m.to,
+            qCDebug(KPAT_LOG, "move from %d to %d (%d) Prio: %d\n", m.from, m.to,
                      m.turn_index, m.pri );
 #endif
 
diff --git a/main.cpp b/main.cpp
--- a/main.cpp
+++ b/main.cpp
@@ -219,11 +219,11 @@
         f->solver()->translate_layout();
         int ret = f->solver()->patsolve();
         if ( ret == SolverInterface::SolutionExists )
-            fprintf( stdout, "won\n");
+            qCDebug(KPAT_LOG, "won\n");
         else if ( ret == SolverInterface::NoSolutionExists )
-            fprintf( stdout, "lost\n" );
+            qCDebug(KPAT_LOG, "lost\n" );
         else
-            fprintf( stdout, "unknown\n");
+            qCDebug(KPAT_LOG, "unknown\n");
 
         return 0;
     }
@@ -245,20 +245,20 @@
                 f->solver()->translate_layout();
                 int ret = f->solver()->patsolve();
                 if ( ret == SolverInterface::SolutionExists ) {
-                   fprintf( stdout, "%d: %d won (%lld ms)\n", dealer, i, mytime.elapsed() );
+                   qCDebug(KPAT_LOG, "%d: %d won (%lld ms)\n", dealer, i, mytime.elapsed() );
                    count--;
                    QFile file(QStringLiteral("%1/%2-%3-1").arg(testdir).arg(dealer).arg(i));
                    file.open( QFile::WriteOnly );
                    f->saveLegacyFile( &file );
                 }
                 else if ( ret == SolverInterface::NoSolutionExists ) {
-                   fprintf( stdout, "%d: %d lost (%lld ms)\n", dealer, i, mytime.elapsed()  );
+                   qCDebug(KPAT_LOG, "%d: %d lost (%lld ms)\n", dealer, i, mytime.elapsed()  );
                    count--;
                    QFile file(QStringLiteral("%1/%2-%3-0").arg(testdir).arg(dealer).arg(i));
                    file.open( QFile::WriteOnly );
                    f->saveLegacyFile( &file );
                 } else {
-                   fprintf( stdout, "%d: %d unknown (%lld ms)\n", dealer, i, mytime.elapsed() );
+                   qCDebug(KPAT_LOG, "%d: %d unknown (%lld ms)\n", dealer, i, mytime.elapsed() );
                 }
              }
           }
@@ -310,13 +310,13 @@
             f->solver()->translate_layout();
             int ret = f->solver()->patsolve();
             if ( ret == SolverInterface::SolutionExists )
-                fprintf( stdout, "%d won (%lld ms)\n", i, mytime.elapsed() );
+                qCDebug(KPAT_LOG, "%d won (%lld ms)\n", i, mytime.elapsed() );
             else if ( ret == SolverInterface::NoSolutionExists )
-                fprintf( stdout, "%d lost (%lld ms)\n", i, mytime.elapsed()  );
+                qCDebug(KPAT_LOG, "%d lost (%lld ms)\n", i, mytime.elapsed()  );
             else
-                fprintf( stdout, "%d unknown (%lld ms)\n", i, mytime.elapsed() );
+                qCDebug(KPAT_LOG, "%d unknown (%lld ms)\n", i, mytime.elapsed() );
         }
-        fprintf( stdout, "all_moves %ld\n", all_moves );
+        qCDebug(KPAT_LOG, "all_moves %ld\n", all_moves );
         return 0;
     }
 
diff --git a/patsolve/abstract_fc_solve_solver.cpp b/patsolve/abstract_fc_solve_solver.cpp
--- a/patsolve/abstract_fc_solve_solver.cpp
+++ b/patsolve/abstract_fc_solve_solver.cpp
@@ -161,7 +161,7 @@
     const long reached_iters = freecell_solver_user_get_num_times_long(solver_instance);
     Q_ASSERT(reached_iters <= default_max_positions);
 #if 0
-    fprintf(stderr, "iters = %ld\n", reached_iters);
+    qCDebug(KPAT_LOG, "iters = %ld\n", reached_iters);
 #endif
 
     switch (solver_ret)
@@ -245,21 +245,21 @@
 #if 0
     int i, w, o;
 
-    fprintf(stderr, "print-layout-begin\n");
+    qCDebug(KPAT_LOG, "print-layout-begin\n");
     for (w = 0; w < 10; ++w) {
         Q_ASSERT( Wp[w] == &W[w][Wlen[w]-1] );
-        fprintf( stderr, "Play%d: ", w );
+        qCDebug(KPAT_LOG, "Play%d: ", w );
         for (i = 0; i < Wlen[w]; ++i) {
             printcard(W[w][i], stderr);
         }
         fputc('\n', stderr);
     }
-    fprintf( stderr, "Off: " );
+    qCDebug(KPAT_LOG, "Off: " );
     for (o = 0; o < 4; ++o) {
         if ( O[o] != -1 )
             printcard( O[o] + PS_KING, stderr);
     }
-    fprintf(stderr, "\nprint-layout-end\n");
+    qCDebug(KPAT_LOG, "\nprint-layout-end\n");
 #endif
 }
 
diff --git a/patsolve/clocksolver.cpp b/patsolve/clocksolver.cpp
--- a/patsolve/clocksolver.cpp
+++ b/patsolve/clocksolver.cpp
@@ -29,9 +29,9 @@
 {
 #if PRINT
     if ( m->totype == O_Type )
-        fprintf( stderr, "\nmake move %d from %d out %d (at %d)\n\n", m->card_index, m->from, m->to, m->turn_index );
+        qCDebug(KPAT_LOG, "\nmake move %d from %d out %d (at %d)\n\n", m->card_index, m->from, m->to, m->turn_index );
     else
-        fprintf( stderr, "\nmake move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
+        qCDebug(KPAT_LOG, "\nmake move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
     print_layout();
 #else
     //print_layout();
@@ -71,9 +71,9 @@
 {
 #if PRINT2
     if ( m->totype == O_Type )
-        fprintf( stderr, "\nundo move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
+        qCDebug(KPAT_LOG, "\nundo move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
     else
-        fprintf( stderr, "\nundo move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
+        qCDebug(KPAT_LOG, "\nundo move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
     print_layout();
 
 #endif
@@ -279,17 +279,17 @@
 {
     int i, w, o;
 
-    fprintf(stderr, "print-layout-begin\n");
+    qCDebug(KPAT_LOG, "print-layout-begin\n");
     for (w = 0; w < 8; ++w) {
-        fprintf( stderr, "Play%d: ", w );
+        qCDebug(KPAT_LOG, "Play%d: ", w );
         for (i = 0; i < Wlen[w]; ++i) {
             printcard(W[w][i], stderr);
         }
         fputc('\n', stderr);
     }
-    fprintf( stderr, "Off: " );
+    qCDebug(KPAT_LOG, "Off: " );
     for (o = 0; o < 12; ++o) {
         printcard(W[8][o], stderr);
     }
-    fprintf(stderr, "\nprint-layout-end\n");
+    qCDebug(KPAT_LOG, "\nprint-layout-end\n");
 }
diff --git a/patsolve/fortyeightsolver.cpp b/patsolve/fortyeightsolver.cpp
--- a/patsolve/fortyeightsolver.cpp
+++ b/patsolve/fortyeightsolver.cpp
@@ -81,9 +81,9 @@
 {
 #if PRINT
     if ( m->totype == O_Type )
-      fprintf( stderr, "\nmake move %d from %d to %d out (at %d)\n\n", m->card_index, m->from, m->to, m->turn_index );
+      qCDebug(KPAT_LOG, "\nmake move %d from %d to %d out (at %d)\n\n", m->card_index, m->from, m->to, m->turn_index );
     else
-        fprintf( stderr, "\nmake move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
+        qCDebug(KPAT_LOG, "\nmake move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
     print_layout();
 #endif
 
@@ -159,9 +159,9 @@
 {
 #if PRINT
     if ( m->totype == O_Type )
-      fprintf( stderr, "\nundo move %d from %d to %d out (at %d)\n\n", m->card_index, m->from, m->to, m->turn_index );
+      qCDebug(KPAT_LOG, "\nundo move %d from %d to %d out (at %d)\n\n", m->card_index, m->from, m->to, m->turn_index );
     else
-        fprintf( stderr, "\nundo move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
+        qCDebug(KPAT_LOG, "\nundo move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
     print_layout();
 #endif
 
@@ -358,7 +358,7 @@
         }
     }
 
-    //fprintf(stderr, "\n");
+    //qCDebug(KPAT_LOG, "\n");
     *numout = n;
 
     for (int w = 0; w < 8; w++)
@@ -435,7 +435,7 @@
                     {
                         /*      printcard( W[w][Wlen[w]-i-1], stderr );
                         printcard( *Wp[w], stderr );
-                        fprintf( stderr, " switch? %d\n", i ); */
+                        qCDebug(KPAT_LOG, " switch? %d\n", i ); */
 		      if ( SUIT( W[w][Wlen[w]-i-1] ) != SUIT( *Wp[w] ) ||
 			   RANK ( W[w][Wlen[w]-i-1] ) != RANK ( W[w][Wlen[w]-i] ) + 1)
 			{
@@ -467,7 +467,7 @@
                         card_t cur = W[w][Wlen[w]-i];
                         /* printcard( top, stderr );
                         printcard( cur, stderr );
-                        fprintf( stderr, " %d\n", i ); */
+                        qCDebug(KPAT_LOG, " %d\n", i ); */
                         Q_ASSERT( SUIT( top ) == SUIT( cur ) );
                         if ( RANK( top ) == RANK( cur ) + 1 )
                         {
@@ -658,29 +658,29 @@
     FortyeightSolverState d;
     checkState(d);
 
-    fprintf(stderr, "print-layout-begin\n");
+    qCDebug(KPAT_LOG, "print-layout-begin\n");
     for (int w = 0; w < 10; w++) {
         if ( w == NUM_DECK )
-            fprintf( stderr, "Deck(9): " );
+            qCDebug(KPAT_LOG, "Deck(9): " );
         else if ( w == 8 )
-            fprintf( stderr, "Pile(8): " );
+            qCDebug(KPAT_LOG, "Pile(8): " );
         else if ( w < 8 )
-            fprintf( stderr, "Play%d: ", w );
+            qCDebug(KPAT_LOG, "Play%d: ", w );
         for (int i = 0; i < Wlen[w]; i++) {
             printcard(W[w][i], stderr);
         }
         fputc('\n', stderr);
     }
-    fprintf( stderr, "Off: " );
+    qCDebug(KPAT_LOG, "Off: " );
     for (int o = 0; o < 8; ++o) {
       printcard(O[o] + Osuit[o], stderr);
     }
-    fprintf( stderr, "\nLast-Deal: %d\n", lastdeal );
+    qCDebug(KPAT_LOG, "\nLast-Deal: %d\n", lastdeal );
 #if 1
-    fprintf( stderr, "FE: %d FS: %d\n", d.firstempty, d.freestores);
+    qCDebug(KPAT_LOG, "FE: %d FS: %d\n", d.firstempty, d.freestores);
     for (int o = 0; o < 8; ++o) {
-      fprintf( stderr, "Pile%d: empty:%d linedup:%d highestbreak:%d fromscore:%d\n", o, d.empty[o], d.linedup[o], d.highestbreak[o], d.fromscore[o]);
+      qCDebug(KPAT_LOG, "Pile%d: empty:%d linedup:%d highestbreak:%d fromscore:%d\n", o, d.empty[o], d.linedup[o], d.highestbreak[o], d.fromscore[o]);
     }
 #endif
-    fprintf(stderr, "print-layout-end\n");
+    qCDebug(KPAT_LOG, "print-layout-end\n");
 }
diff --git a/patsolve/freecellsolver.cpp b/patsolve/freecellsolver.cpp
--- a/patsolve/freecellsolver.cpp
+++ b/patsolve/freecellsolver.cpp
@@ -551,22 +551,22 @@
 {
        int i, t, w, o;
 
-       fprintf(stderr, "print-layout-begin\n");
+       qCDebug(KPAT_LOG, "print-layout-begin\n");
        for (w = 0; w < Nwpiles; ++w) {
-	 fprintf(stderr, "W-Pile%d: ", w);
+	 qCDebug(KPAT_LOG, "W-Pile%d: ", w);
                for (i = 0; i < Wlen[w]; ++i) {
                        printcard(W[w][i], stderr);
                }
                fputc('\n', stderr);
        }
        for (t = 0; t < Ntpiles; ++t) {
-	 fprintf(stderr, "T-Pile%d: ", t+Nwpiles);
+	 qCDebug(KPAT_LOG, "T-Pile%d: ", t+Nwpiles);
            printcard(W[t+Nwpiles][Wlen[t+Nwpiles]], stderr);
        }
-       fprintf( stderr, "\n" );
+       qCDebug(KPAT_LOG, "\n" );
        for (o = 0; o < 4; ++o) {
                printcard(O[o] + Osuit[o], stderr);
        }
-       fprintf(stderr, "\nprint-layout-end\n");
+       qCDebug(KPAT_LOG, "\nprint-layout-end\n");
 }
 #endif
diff --git a/patsolve/golfsolver.cpp b/patsolve/golfsolver.cpp
--- a/patsolve/golfsolver.cpp
+++ b/patsolve/golfsolver.cpp
@@ -33,9 +33,9 @@
 #ifndef WITH_BH_SOLVER
 #if PRINT
     if ( m->totype == O_Type )
-        fprintf( stderr, "\nmake move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
+        qCDebug(KPAT_LOG, "\nmake move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
     else
-        fprintf( stderr, "\nmake move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
+        qCDebug(KPAT_LOG, "\nmake move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
     print_layout();
 #else
     //print_layout();
@@ -88,9 +88,9 @@
 #ifndef WITH_BH_SOLVER
 #if PRINT
     if ( m->totype == O_Type )
-        fprintf( stderr, "\nundo move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
+        qCDebug(KPAT_LOG, "\nundo move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
     else
-        fprintf( stderr, "\nundo move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
+        qCDebug(KPAT_LOG, "\nundo move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
     print_layout();
 
 #endif
@@ -263,7 +263,7 @@
             BHS__GOLF__BITS_PER_COL
     ))
     {
-        fprintf(stderr, "Error reading the board at line No. %d!\n",
+        qCDebug(KPAT_LOG, "Error reading the board at line No. %d!\n",
             error_line_num);
         exit(-1);
     }
@@ -395,19 +395,19 @@
 void GolfSolver::print_layout()
 {
 #ifndef WITH_BH_SOLVER
-    fprintf(stderr, "print-layout-begin\n");
+    qCDebug(KPAT_LOG, "print-layout-begin\n");
     for (int w = 0; w < 9; w++) {
         if ( w == 8 )
-            fprintf( stderr, "Deck: " );
+            qCDebug(KPAT_LOG, "Deck: " );
         else if ( w == 7 )
-            fprintf( stderr, "Pile: " );
+            qCDebug(KPAT_LOG, "Pile: " );
         else
-            fprintf( stderr, "Play%d: ", w );
+            qCDebug(KPAT_LOG, "Play%d: ", w );
         for (int i = 0; i < Wlen[w]; i++) {
             printcard(W[w][i], stderr);
         }
         fputc('\n', stderr);
     }
-    fprintf(stderr, "print-layout-end\n");
+    qCDebug(KPAT_LOG, "print-layout-end\n");
 #endif
 }
diff --git a/patsolve/grandfsolver.cpp b/patsolve/grandfsolver.cpp
--- a/patsolve/grandfsolver.cpp
+++ b/patsolve/grandfsolver.cpp
@@ -28,11 +28,11 @@
 {
 #if PRINT
     if ( m->totype == O_Type )
-        fprintf( stderr, "\nmake move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
+        qCDebug(KPAT_LOG, "\nmake move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
     else if ( m->from == offs )
-        fprintf( stderr, "\nmake redeal\n\n" );
+        qCDebug(KPAT_LOG, "\nmake redeal\n\n" );
     else
-        fprintf( stderr, "\nmake move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
+        qCDebug(KPAT_LOG, "\nmake move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
     print_layout();
 #else
     //print_layout();
@@ -174,11 +174,11 @@
 {
 #if PRINT
     if ( m->totype == O_Type )
-        fprintf( stderr, "\nundo move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
+        qCDebug(KPAT_LOG, "\nundo move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
     else if ( m->from == offs )
-        fprintf( stderr, "\nundo redeal\n\n" );
+        qCDebug(KPAT_LOG, "\nundo redeal\n\n" );
     else
-        fprintf( stderr, "\nundo move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
+        qCDebug(KPAT_LOG, "\nundo move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
     print_layout();
 
 #endif
@@ -326,10 +326,10 @@
                 // TODO: there is no point in moving if we're not opening anything
                 // e.g. if both i and j have perfect runs below the cards
 #if 0
-                fprintf( stderr, "%d %d %d\n", i, l, j );
+                qCDebug(KPAT_LOG, "%d %d %d\n", i, l, j );
                 printcard( card, stderr );
                 printcard( *Wp[j], stderr );
-                fprintf( stderr, " allowed %d\n",allowed );
+                qCDebug(KPAT_LOG, " allowed %d\n",allowed );
 #endif
                 if ( allowed )
 		{
@@ -484,19 +484,19 @@
 {
     int i, w, o;
 
-    fprintf(stderr, "print-layout-begin\n");
+    qCDebug(KPAT_LOG, "print-layout-begin\n");
     for (w = 0; w < 21; ++w) {
-        fprintf( stderr, "Play%d-%d(%d): ", w / 7, w % 7, w );
+        qCDebug(KPAT_LOG, "Play%d-%d(%d): ", w / 7, w % 7, w );
         for (i = 0; i < Wlen[w]; ++i) {
             printcard(W[w][i], stderr);
         }
         fputc('\n', stderr);
     }
-    fprintf( stderr, "Off: " );
+    qCDebug(KPAT_LOG, "Off: " );
     for (o = 0; o < 4; ++o) {
         if ( !DOWN( W[offs][o] ) )
             printcard(RANK( W[offs][o] ) + Osuit[o], stderr);
     }
-    fprintf( stderr, "\nRedeals: %d", m_redeal );
-    fprintf(stderr, "\nprint-layout-end\n");
+    qCDebug(KPAT_LOG, "\nRedeals: %d", m_redeal );
+    qCDebug(KPAT_LOG, "\nprint-layout-end\n");
 }
diff --git a/patsolve/gypsysolver.cpp b/patsolve/gypsysolver.cpp
--- a/patsolve/gypsysolver.cpp
+++ b/patsolve/gypsysolver.cpp
@@ -33,9 +33,9 @@
 #if PRINT
     //qCDebug(KPAT_LOG) << "\n\nmake_move\n";
     if ( m->totype == O_Type )
-        fprintf( stderr, "move %d from %d out (at %d) Prio: %d\n\n", m->card_index, m->from, m->turn_index, m->pri );
+        qCDebug(KPAT_LOG, "move %d from %d out (at %d) Prio: %d\n\n", m->card_index, m->from, m->turn_index, m->pri );
     else
-        fprintf( stderr, "move %d from %d to %d (%d) Prio: %d\n\n", m->card_index, m->from, m->to, m->turn_index, m->pri );
+        qCDebug(KPAT_LOG, "move %d from %d to %d (%d) Prio: %d\n\n", m->card_index, m->from, m->to, m->turn_index, m->pri );
     print_layout();
 #else
     //print_layout();
@@ -121,9 +121,9 @@
 #if PRINT
     //qCDebug(KPAT_LOG) << "\n\nundo_move\n";
     if ( m->totype == O_Type )
-        fprintf( stderr, "move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
+        qCDebug(KPAT_LOG, "move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
     else
-        fprintf( stderr, "move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
+        qCDebug(KPAT_LOG, "move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
     print_layout();
 
 #endif
@@ -504,24 +504,24 @@
 {
     int i, w, o;
 
-    fprintf(stderr, "print-layout-begin\n");
+    qCDebug(KPAT_LOG, "print-layout-begin\n");
     for (w = 0; w < 8; ++w) {
-        fprintf( stderr, "Play%d: ", w );
+        qCDebug(KPAT_LOG, "Play%d: ", w );
         for (i = 0; i < Wlen[w]; ++i) {
             printcard(W[w][i], stderr);
         }
         fputc('\n', stderr);
     }
-    fprintf( stderr, "Off: " );
+    qCDebug(KPAT_LOG, "Off: " );
     for (o = 0; o < 8; ++o) {
         if ( Wlen[outs + o] )
             printcard( *Wp[outs + o], stderr);
     }
-    fprintf( stderr, "\nDeck: " );
+    qCDebug(KPAT_LOG, "\nDeck: " );
     for (i = 0; i < Wlen[deck]; ++i)
         printcard(W[deck][i], stderr);
 
-    fprintf(stderr, "\nprint-layout-end\n");
+    qCDebug(KPAT_LOG, "\nprint-layout-end\n");
     return;
 }
 
diff --git a/patsolve/idiotsolver.cpp b/patsolve/idiotsolver.cpp
--- a/patsolve/idiotsolver.cpp
+++ b/patsolve/idiotsolver.cpp
@@ -28,9 +28,9 @@
 {
 #if PRINT
     if ( m->totype == O_Type )
-        fprintf( stderr, "\nmake move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
+        qCDebug(KPAT_LOG, "\nmake move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
     else
-        fprintf( stderr, "\nmake move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
+        qCDebug(KPAT_LOG, "\nmake move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
     print_layout();
 #else
     //print_layout();
@@ -79,9 +79,9 @@
 {
 #if PRINT
     if ( m->totype == O_Type )
-        fprintf( stderr, "\nundo move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
+        qCDebug(KPAT_LOG, "\nundo move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
     else
-        fprintf( stderr, "\nundo move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
+        qCDebug(KPAT_LOG, "\nundo move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
     print_layout();
 
 #endif
@@ -252,20 +252,20 @@
 {
     int i, w;
 
-    fprintf(stderr, "print-layout-begin\n");
+    qCDebug(KPAT_LOG, "print-layout-begin\n");
     for (w = 0; w < 6; ++w) {
         if ( w == 4 )
-            fprintf( stderr, "Deck: " );
+            qCDebug(KPAT_LOG, "Deck: " );
         else if ( w == 5 )
-            fprintf( stderr, "Away: " );
+            qCDebug(KPAT_LOG, "Away: " );
         else
-            fprintf( stderr, "Play%d: ", w );
+            qCDebug(KPAT_LOG, "Play%d: ", w );
         for (i = 0; i < Wlen[w]; ++i) {
             printcard(W[w][i], stderr);
         }
         fputc('\n', stderr);
     }
-    fprintf(stderr, "\nprint-layout-end\n");
+    qCDebug(KPAT_LOG, "\nprint-layout-end\n");
 }
 
 inline bool higher( const card_t &c1, const card_t &c2)
diff --git a/patsolve/klondikesolver.cpp b/patsolve/klondikesolver.cpp
--- a/patsolve/klondikesolver.cpp
+++ b/patsolve/klondikesolver.cpp
@@ -35,9 +35,9 @@
 {
 #if PRINT
     if ( m->totype == O_Type )
-        fprintf( stderr, "\nmake move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
+        qCDebug(KPAT_LOG, "\nmake move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
     else
-        fprintf( stderr, "\nmake move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
+        qCDebug(KPAT_LOG, "\nmake move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
     print_layout();
 #else
     //print_layout();
@@ -139,9 +139,9 @@
 {
 #if PRINT
     if ( m->totype == O_Type )
-        fprintf( stderr, "\nundo move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
+        qCDebug(KPAT_LOG, "\nundo move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
     else
-        fprintf( stderr, "\nundo move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
+        qCDebug(KPAT_LOG, "\nundo move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
     print_layout();
 
 #endif
@@ -398,13 +398,13 @@
                     card_t below = W[i][Wlen[i]-2-l];
                     int o = SUIT(below);
                     bool empty = (O[o] == NONE);
-                    //fprintf( stderr, "%d %d\n", i, l );
+                    //qCDebug(KPAT_LOG, "%d %d\n", i, l );
                     //printcard( below, stderr );
 
                     if ( ( empty && RANK( below ) != PS_ACE ) ||
                          ( !empty && RANK( below ) != O[o] + 1 ) )
                         allowed = 0;
-                    //fprintf( stderr, " allowed %d %d %d %d\n",allowed, empty, RANK( below ), PS_ACE);
+                    //qCDebug(KPAT_LOG, " allowed %d %d %d %d\n",allowed, empty, RANK( below ), PS_ACE);
                 }
                 if ( allowed ) {
                     mp->card_index = l;
@@ -579,22 +579,22 @@
 {
     int i, w, o;
 
-    fprintf(stderr, "print-layout-begin\n");
+    qCDebug(KPAT_LOG, "print-layout-begin\n");
     for (w = 0; w < 9; ++w) {
         if ( w == 8 )
-            fprintf( stderr, "Deck: " );
+            qCDebug(KPAT_LOG, "Deck: " );
         else if ( w == 7 )
-            fprintf( stderr, "Pile: " );
+            qCDebug(KPAT_LOG, "Pile: " );
         else
-            fprintf( stderr, "Play%d: ", w );
+            qCDebug(KPAT_LOG, "Play%d: ", w );
         for (i = 0; i < Wlen[w]; ++i) {
             printcard(W[w][i], stderr);
         }
         fputc('\n', stderr);
     }
-    fprintf( stderr, "Off: " );
+    qCDebug(KPAT_LOG, "Off: " );
     for (o = 0; o < 4; ++o) {
         printcard(O[o] + Osuit[o], stderr);
     }
-    fprintf(stderr, "\nprint-layout-end\n");
+    qCDebug(KPAT_LOG, "\nprint-layout-end\n");
 }
diff --git a/patsolve/mod3solver.cpp b/patsolve/mod3solver.cpp
--- a/patsolve/mod3solver.cpp
+++ b/patsolve/mod3solver.cpp
@@ -29,9 +29,9 @@
 {
 #if PRINT
     if ( m->totype == O_Type )
-        fprintf( stderr, "\nmake move %d from %d out %d (at %d)\n\n", m->card_index, m->from, m->to, m->turn_index );
+        qCDebug(KPAT_LOG, "\nmake move %d from %d out %d (at %d)\n\n", m->card_index, m->from, m->to, m->turn_index );
     else
-        fprintf( stderr, "\nmake move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
+        qCDebug(KPAT_LOG, "\nmake move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
     print_layout();
 #else
     //print_layout();
@@ -101,9 +101,9 @@
 {
 #if PRINT2
     if ( m->totype == O_Type )
-        fprintf( stderr, "\nundo move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
+        qCDebug(KPAT_LOG, "\nundo move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
     else
-        fprintf( stderr, "\nundo move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
+        qCDebug(KPAT_LOG, "\nundo move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
     print_layout();
 
 #endif
@@ -223,14 +223,14 @@
 	      if (firstfree[row] < 0)
 		firstfree[row] = j;
 	      
-	      //fprintf(stderr, "firstfree %d %d %d\n", row, firstfree[row], j);
+	      //qCDebug(KPAT_LOG, "firstfree %d %d %d\n", row, firstfree[row], j);
 	      if (j != firstfree[row] && row < 4)
 		continue;
 	    }
 	      
             if ( Wlen[j] && RANK( *Wp[j] ) != row + 2 + ( Wlen[j] - 1 ) * 3 )
             {
-                //fprintf( stderr, "rank %d %d\n", i, j );
+                //qCDebug(KPAT_LOG, "rank %d %d\n", i, j );
                 continue;
             }
 
@@ -404,42 +404,42 @@
 {
     int i, w = 0, o;
 
-    fprintf(stderr, "print-layout-begin\n");
+    qCDebug(KPAT_LOG, "print-layout-begin\n");
     for ( int row = 0; row < 3; ++row )
     {
-        fprintf( stderr, "Row%d: ", row );
+        qCDebug(KPAT_LOG, "Row%d: ", row );
         for (int col = 0; col < 8; col++)
         {
             if ( Wlen[w] )
                 printcard(*Wp[w], stderr);
             else
-                fprintf( stderr, "   " );
-            fprintf( stderr, "(%02d) ", w );
+                qCDebug(KPAT_LOG, "   " );
+            qCDebug(KPAT_LOG, "(%02d) ", w );
             w++;
         }
         fputc('\n', stderr);
     }
 
     for (int col = 0; col < 8; col++)
     {
-        fprintf( stderr, "Play%02d: ", w );
+        qCDebug(KPAT_LOG, "Play%02d: ", w );
         for (i = 0; i < Wlen[w]; ++i) {
             printcard(W[w][i], stderr);
         }
         fputc('\n', stderr);
         w++;
     }
 
-    fprintf( stderr, "Aces: " );
+    qCDebug(KPAT_LOG, "Aces: " );
     for (o = 0; o < Wlen[aces]; ++o) {
         printcard(W[aces][o], stderr);
     }
     fputc( '\n', stderr );
 
-    fprintf( stderr, "Deck: " );
+    qCDebug(KPAT_LOG, "Deck: " );
     for (o = 0; o < Wlen[deck]; ++o) {
         printcard(W[deck][o], stderr);
     }
 
-    fprintf(stderr, "\nprint-layout-end\n");
+    qCDebug(KPAT_LOG, "\nprint-layout-end\n");
 }
diff --git a/patsolve/patsolve.cpp b/patsolve/patsolve.cpp
--- a/patsolve/patsolve.cpp
+++ b/patsolve/patsolve.cpp
@@ -89,14 +89,14 @@
 #ifndef NDEBUG
         {
 	    print_layout();
-	    fprintf( stderr, "moves %d\n", n );
+	    qCDebug(KPAT_LOG, "moves %d\n", n );
 	    for (int j = 0; j < n; j++) {
-	      fprintf( stderr,  "  " );
+	      qCDebug(KPAT_LOG,  "  " );
 	      if ( Possible[j].totype == O_Type )
-                fprintf( stderr, "move from %d out (at %d) Prio: %d\n", Possible[j].from,
+                qCDebug(KPAT_LOG, "move from %d out (at %d) Prio: %d\n", Possible[j].from,
                          Possible[j].turn_index, Possible[j].pri );
 	      else
-                fprintf( stderr, "move %d from %d to %d (%d) Prio: %d\n", Possible[j].card_index,
+                qCDebug(KPAT_LOG, "move %d from %d to %d (%d) Prio: %d\n", Possible[j].card_index,
                          Possible[j].from, Possible[j].to,
                          Possible[j].turn_index, Possible[j].pri );
 	    }
@@ -172,9 +172,9 @@
 				return;
 			}
 		}
-                //fprintf( stderr, "%d ", Wpilenum[w] );
+                //qCDebug(KPAT_LOG, "%d ", Wpilenum[w] );
 	}
-        //fprintf( stderr, "\n" );
+        //qCDebug(KPAT_LOG, "\n" );
 }
 
 #define NBUCKETS 65521           /* the largest 16 bit prime */
@@ -448,11 +448,11 @@
 
 #if 0
 if (w < 4) {
-        fprintf( stderr, "get_pile_num %d ", l->pilenum );
+        qCDebug(KPAT_LOG, "get_pile_num %d ", l->pilenum );
         for (int i = 0; i < Wlen[w]; ++i) {
             printcard(W[w][i], stderr);
         }
-        fprintf( stderr, "\n" );
+        qCDebug(KPAT_LOG, "\n" );
 }
 #endif
 	return l->pilenum;
diff --git a/patsolve/simonsolver.cpp b/patsolve/simonsolver.cpp
--- a/patsolve/simonsolver.cpp
+++ b/patsolve/simonsolver.cpp
@@ -39,9 +39,9 @@
 #if PRINT
     //qCDebug(KPAT_LOG) << "\n\nmake_move\n";
     if ( m->totype == O_Type )
-        fprintf( stderr, "move %d from %d out (at %d) Prio: %d\n\n", m->card_index, m->from, m->turn_index, m->pri );
+        qCDebug(KPAT_LOG, "move %d from %d out (at %d) Prio: %d\n\n", m->card_index, m->from, m->turn_index, m->pri );
     else
-        fprintf( stderr, "move %d from %d to %d (%d) Prio: %d\n\n", m->card_index, m->from, m->to, m->turn_index, m->pri );
+        qCDebug(KPAT_LOG, "move %d from %d to %d (%d) Prio: %d\n\n", m->card_index, m->from, m->to, m->turn_index, m->pri );
     print_layout();
 #else
     //print_layout();
@@ -93,9 +93,9 @@
 #if PRINT
     //qCDebug(KPAT_LOG) << "\n\nundo_move\n";
     if ( m->totype == O_Type )
-        fprintf( stderr, "move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
+        qCDebug(KPAT_LOG, "move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
     else
-        fprintf( stderr, "move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
+        qCDebug(KPAT_LOG, "move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
     print_layout();
 
 #endif
@@ -310,7 +310,7 @@
                          RANK( card_below ) == RANK( card ) + 1 )
                     {
                         if ( conti[j]+l != 13 || conti[i]>conti[j]+l || SUIT( card ) != SUIT( *Wp[j] ) ) {
-                            // fprintf( stderr, "continue\n" );
+                            // qCDebug(KPAT_LOG, "continue\n" );
                             continue;
                         }
                     }
@@ -463,21 +463,21 @@
 {
     int i, w, o;
 
-    fprintf(stderr, "print-layout-begin\n");
+    qCDebug(KPAT_LOG, "print-layout-begin\n");
     for (w = 0; w < 10; ++w) {
         Q_ASSERT( Wp[w] == &W[w][Wlen[w]-1] );
-        fprintf( stderr, "Play%d: ", w );
+        qCDebug(KPAT_LOG, "Play%d: ", w );
         for (i = 0; i < Wlen[w]; ++i) {
             printcard(W[w][i], stderr);
         }
         fputc('\n', stderr);
     }
-    fprintf( stderr, "Off: " );
+    qCDebug(KPAT_LOG, "Off: " );
     for (o = 0; o < 4; ++o) {
         if ( O[o] != -1 )
             printcard( O[o] + PS_KING, stderr);
     }
-    fprintf(stderr, "\nprint-layout-end\n");
+    qCDebug(KPAT_LOG, "\nprint-layout-end\n");
 }
 #endif
 
diff --git a/patsolve/spidersolver.cpp b/patsolve/spidersolver.cpp
--- a/patsolve/spidersolver.cpp
+++ b/patsolve/spidersolver.cpp
@@ -29,9 +29,9 @@
 #if PRINT
     //qCDebug(KPAT_LOG) << "\n\nmake_move\n";
     if ( m->totype == O_Type )
-        fprintf( stderr, "move %d from %d out (at %d) Prio: %d\n\n", m->card_index, m->from, m->turn_index, m->pri );
+        qCDebug(KPAT_LOG, "move %d from %d out (at %d) Prio: %d\n\n", m->card_index, m->from, m->turn_index, m->pri );
     else
-        fprintf( stderr, "move %d from %d to %d (%d) Prio: %d\n\n", m->card_index, m->from, m->to, m->turn_index, m->pri );
+        qCDebug(KPAT_LOG, "move %d from %d to %d (%d) Prio: %d\n\n", m->card_index, m->from, m->to, m->turn_index, m->pri );
     print_layout();
 #else
     //print_layout();
@@ -118,9 +118,9 @@
 #if PRINT
     //qCDebug(KPAT_LOG) << "\n\nundo_move\n";
     if ( m->totype == O_Type )
-        fprintf( stderr, "move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
+        qCDebug(KPAT_LOG, "move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
     else
-        fprintf( stderr, "move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
+        qCDebug(KPAT_LOG, "move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
     print_layout();
 
 #endif
@@ -342,20 +342,20 @@
 #if 0
                         printcard( card_below, stderr );
                         printcard( card, stderr );
-                        fprintf( stderr, "%d %d %d %d %d\n", i, j, conti[i], conti[j],l );
+                        qCDebug(KPAT_LOG, "%d %d %d %d %d\n", i, j, conti[i], conti[j],l );
 #endif
                         bool card_stack_j_not_empty = Wlen[j] > 0;
                         if (card_stack_j_not_empty && SUIT( card ) != SUIT( *Wp[j] ) )
                         {
-			  //fprintf( stderr, "continue %d %d %d %d\n",conti[j]+l, conti[i],conti[j]+l, SUIT( card ) != SUIT( *Wp[j] ) );
+			  //qCDebug(KPAT_LOG, "continue %d %d %d %d\n",conti[j]+l, conti[i],conti[j]+l, SUIT( card ) != SUIT( *Wp[j] ) );
                             continue;
                         }
 
 #if 1
                         // too bad: see bug 175945
                         if ( conti[j]+l+1 != 13 || conti[i]>conti[j]+l )
                         {
-                            //fprintf( stderr, "continue %d %d %d %d\n",conti[j]+l, conti[i],conti[j]+l, SUIT( card ) != SUIT( *Wp[j] ) );
+                            //qCDebug(KPAT_LOG, "continue %d %d %d %d\n",conti[j]+l, conti[i],conti[j]+l, SUIT( card ) != SUIT( *Wp[j] ) );
                             //continue;
                         }
 #endif
@@ -417,7 +417,7 @@
                         card_t theone = W[i][Wlen[i]-conti_pos-1];
                         card_t below = W[i][Wlen[i]-conti_pos-2];
 #if 0
-			fprintf(stderr, "checking pile%d len:%d prio:%d ", i, l, mp->pri);
+			qCDebug(KPAT_LOG, "checking pile%d len:%d prio:%d ", i, l, mp->pri);
                         printcard( card, stderr );
                         printcard( theone, stderr );
                         printcard( below, stderr );
@@ -575,24 +575,24 @@
 {
     int i, w, o;
 
-    fprintf(stderr, "print-layout-begin\n");
+    qCDebug(KPAT_LOG, "print-layout-begin\n");
     for (w = 0; w < 15; ++w) {
         Q_ASSERT( Wp[w] == &W[w][Wlen[w]-1] );
         if ( w < 10 )
-            fprintf( stderr, "Play%d: ", w );
+            qCDebug(KPAT_LOG, "Play%d: ", w );
         else
-            fprintf( stderr, "Deal%d: ", w-10 );
+            qCDebug(KPAT_LOG, "Deal%d: ", w-10 );
         for (i = 0; i < Wlen[w]; ++i) {
             printcard(W[w][i], stderr);
         }
         fputc('\n', stderr);
     }
-    fprintf( stderr, "Off: " );
+    qCDebug(KPAT_LOG, "Off: " );
     for (o = 0; o < 8; ++o) {
         if ( O[o] != -1 )
             printcard( O[o] + PS_KING, stderr);
     }
-    fprintf(stderr, "\nprint-layout-end\n");
+    qCDebug(KPAT_LOG, "\nprint-layout-end\n");
     return;
 }
 
diff --git a/patsolve/yukonsolver.cpp b/patsolve/yukonsolver.cpp
--- a/patsolve/yukonsolver.cpp
+++ b/patsolve/yukonsolver.cpp
@@ -36,9 +36,9 @@
 {
 #if PRINT
     if ( m->totype == O_Type )
-        fprintf( stderr, "\nmake move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
+        qCDebug(KPAT_LOG, "\nmake move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
     else
-        fprintf( stderr, "\nmake move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
+        qCDebug(KPAT_LOG, "\nmake move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
     print_layout();
 #else
     //print_layout();
@@ -96,9 +96,9 @@
 {
 #if PRINT
     if ( m->totype == O_Type )
-        fprintf( stderr, "\nundo move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
+        qCDebug(KPAT_LOG, "\nundo move %d from %d out (at %d)\n\n", m->card_index, m->from, m->turn_index );
     else
-        fprintf( stderr, "\nundo move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
+        qCDebug(KPAT_LOG, "\nundo move %d from %d to %d (%d)\n\n", m->card_index, m->from, m->to, m->turn_index );
     print_layout();
 
 #endif
@@ -280,10 +280,10 @@
                 // TODO: there is no point in moving if we're not opening anything
                 // e.g. if both i and j have perfect runs below the cards
 #if 0
-                fprintf( stderr, "%d %d %d\n", i, l, j );
+                qCDebug(KPAT_LOG, "%d %d %d\n", i, l, j );
                 printcard( card, stderr );
                 printcard( *Wp[j], stderr );
-                fprintf( stderr, " allowed %d\n",allowed );
+                qCDebug(KPAT_LOG, " allowed %d\n",allowed );
 #endif
                 if ( allowed ) {
                     mp->card_index = l;
@@ -421,17 +421,17 @@
 {
     int i, w, o;
 
-    fprintf(stderr, "print-layout-begin\n");
+    qCDebug(KPAT_LOG, "print-layout-begin\n");
     for (w = 0; w < 7; ++w) {
-        fprintf( stderr, "Play%d: ", w );
+        qCDebug(KPAT_LOG, "Play%d: ", w );
         for (i = 0; i < Wlen[w]; ++i) {
             printcard(W[w][i], stderr);
         }
         fputc('\n', stderr);
     }
-    fprintf( stderr, "Off: " );
+    qCDebug(KPAT_LOG, "Off: " );
     for (o = 0; o < 4; ++o) {
         printcard(O[o] + Osuit[o], stderr);
     }
-    fprintf(stderr, "\nprint-layout-end\n");
+    qCDebug(KPAT_LOG, "\nprint-layout-end\n");
 }