Removed the OSG_SYSTEM_SUPPORTED cmake var and added use of posix_spawn under Apple with C system function used elsewhere.

src/osg/Config.in

@@ -35,6 +35,5 @@
 #cmakedefine OSG_PROVIDE_READFILE
 #cmakedefine OSG_USE_DEPRECATED_API
 #cmakedefine OSG_ENVVAR_SUPPORTED
-#cmakedefine OSG_SYSTEM_SUPPORTED
 
 #endif

src/osg/os_utils.cpp

@@ -15,14 +15,29 @@
 
 extern "C" {
 
+#define USE_POSIX_SPAWN defined(__APPLE__)
+//#define USE_POSIX_SPAWN true
+
+#if USE_POSIX_SPAWN
+
+#include <spawn.h>
+#include <sys/wait.h>
+
+int osg_system(const char* command)
+{
+    pid_t pid;
+    posix_spawn(&pid, command, NULL, NULL, NULL, NULL);
+    return waitpid(pid, NULL, 0);
+}
+
+#else // use tranditional C sysmtem call for osg_system implementation
+
 int osg_system(const char* command)
 {
-#ifdef OSG_SYSTEM_SUPPORTED
     return system(command);
-#else
-    printf("osg_system(%s) not supported.\n", command);
+}
+
 #endif
-}
 
 }