diff --git a/ksysguardd/Command.c b/ksysguardd/Command.c
--- a/ksysguardd/Command.c
+++ b/ksysguardd/Command.c
@@ -19,6 +19,7 @@
 
 */
 
+#define _POSIX_C_SOURCE /* sig.*set */
 #include <signal.h>
 #include <stdarg.h>
 #include <stdio.h>
diff --git a/ksysguardd/Linux/ProcessList.c b/ksysguardd/Linux/ProcessList.c
--- a/ksysguardd/Linux/ProcessList.c
+++ b/ksysguardd/Linux/ProcessList.c
@@ -18,6 +18,9 @@
 
 */
 
+#define _BSD_SOURCE /* kill, syscall */
+#define _DEFAULT_SOURCE /* Eliminate warning from prev */
+
 #include <ctype.h>
 #include <dirent.h>
 #include <errno.h>
@@ -29,6 +32,7 @@
 #include <sys/resource.h>
 #include <time.h>
 #include <unistd.h>
+#include <sys/syscall.h>
 #include <sys/ptrace.h>
 #include <asm/unistd.h>
 
diff --git a/ksysguardd/Linux/diskstat.c b/ksysguardd/Linux/diskstat.c
--- a/ksysguardd/Linux/diskstat.c
+++ b/ksysguardd/Linux/diskstat.c
@@ -20,6 +20,8 @@
 
 #include <config-workspace.h>
 
+#define _XOPEN_SOURCE /* isascii */
+
 #include <mntent.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -63,8 +65,10 @@
     memset( device, 0, sizeof( device ) );
     sscanf( cmd, "partitions%1024s", device );
 
-    ptr = (char*)rindex( device, '/' );
-    *ptr = '\0';
+    ptr = strrchr( device, '/' );
+    if( ptr ) {
+        *ptr = '\0';
+    }
 
     return (char*)device;
 }
diff --git a/ksysguardd/Linux/netstat.c b/ksysguardd/Linux/netstat.c
--- a/ksysguardd/Linux/netstat.c
+++ b/ksysguardd/Linux/netstat.c
@@ -20,8 +20,11 @@
 
 #include <config-workspace.h>
 
+#define _POSIX_SOURCE /* expose old gethostbyaddr(3) call */
 #include <arpa/inet.h>
 #include <netdb.h>
+#include <sys/types.h>
+#include <sys/socket.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -264,10 +267,10 @@
 {
 	FILE *netstat;
 	char buffer[1024];
-	uint local_addr, local_port;
-	uint remote_addr, remote_port;
+	unsigned local_addr, local_port;
+	unsigned remote_addr, remote_port;
 	int uid;
-	uint state;
+	unsigned state;
 	SocketInfo *socket_info;
 
 	if (strstr(cmd, "tcp")) {
diff --git a/ksysguardd/Linux/softraid.c b/ksysguardd/Linux/softraid.c
--- a/ksysguardd/Linux/softraid.c
+++ b/ksysguardd/Linux/softraid.c
@@ -21,6 +21,7 @@
 #include "ksysguardd.h"
 #include "softraid.h"
 
+#define _POSIX_C_SOURCE 200809L /* strndup */
 #include <string.h> /* for strlen, strcat and strcmp */
 #include <stdio.h> /* for sprintf */
 #include <sys/types.h> /* for open */
diff --git a/ksysguardd/PWUIDCache.c b/ksysguardd/PWUIDCache.c
--- a/ksysguardd/PWUIDCache.c
+++ b/ksysguardd/PWUIDCache.c
@@ -18,6 +18,8 @@
 
 */
 
+#define _POSIX_C_SOURCE 200809L /* strdup */
+
 #include <pwd.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/ksysguardd/conf.c b/ksysguardd/conf.c
--- a/ksysguardd/conf.c
+++ b/ksysguardd/conf.c
@@ -20,6 +20,7 @@
 
 #include "config-ksysguardd.h"
 
+#define _POSIX_C_SOURCE 200809L /* strdup */
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/ksysguardd/ksysguardd.c b/ksysguardd/ksysguardd.c
--- a/ksysguardd/ksysguardd.c
+++ b/ksysguardd/ksysguardd.c
@@ -22,6 +22,9 @@
 
 */
 
+/* strdup, fileno, fdopen */
+#define _POSIX_C_SOURCE 200809L
+
 #include <config-workspace.h>
 #include <ctype.h>
 #include <fcntl.h>