diff --git src/cpHastySpace.c src/cpHastySpace.c
index 8dca425..e087df8 100644
--- a/src/cpHastySpace.c
+++ b/src/cpHastySpace.c
@@ -8,7 +8,9 @@
 
 //#include <sys/param.h >
 #ifndef _WIN32
+#ifdef __APPLE__
 #include <sys/sysctl.h>
+#endif
 #include <pthread.h>
 #else
 #ifndef WIN32_LEAN_AND_MEAN