diff --git a/source/lib/config.h b/source/lib/config.h
index 0a2646efc4..df0d53efb3 100755
--- a/source/lib/config.h
+++ b/source/lib/config.h
@@ -2,10 +2,12 @@
 # define OS_WIN
 #elif defined(linux)
 # define OS_LINUX
+# define OS_UNIX
 #elif defined(macintosh)
 # define OS_MACOS
 #elif defined(__APPLE__)  && defined(__MACH__)
 # define OS_MACOSX
+# define OS_UNIX
 #else
 # error "unknown OS - add define here"
 #endif
@@ -23,5 +25,12 @@
 #undef HAVE_GETTIMEOFDAY
 #undef HAVE_X
 
+#ifdef OS_UNIX
+# define HAVE_GETTIMEOFDAY
+#endif
+
+#ifdef OS_LINUX
+# define HAVE_X
+#endif
 
 #undef CONFIG_DISABLE_EXCEPTIONS