diff --git a/cmake/modules/FindAptPkg.cmake b/cmake/modules/FindAptPkg.cmake
--- a/cmake/modules/FindAptPkg.cmake
+++ b/cmake/modules/FindAptPkg.cmake
@@ -23,6 +23,11 @@
 FIND_LIBRARY(APTPKG_LIBRARY_RELEASE NAMES apt-pkg )
 FIND_LIBRARY(APTINST_LIBRARY NAMES apt-inst )
 
+# apt-inst is optional these days!
+IF ( NOT APTINST_LIBRARY )
+    SET( APTINST_LIBRARY "" )
+ENDIF( )
+
 FIND_LIBRARY(APTPKG_LIBRARY_DEBUG NAMES apt-pkg apt-pkgd  HINTS /usr/lib/debug/usr/lib/ )
 
 IF( APTPKG_LIBRARY_RELEASE OR APTPKG_LIBRARY_DEBUG AND APTPKG_INCLUDE_DIR )