config.h cannot work after linux features.h

Bail if that's the case

Author: krono

platforms/unix/config/config.h.in

@@ -35,6 +35,10 @@
 #ifndef __sq_config_h
 #define __sq_config_h
 
+#ifdef _FEATURES_H
+#error This file was included too late. Please make sure it is included earlier
+#endif
+
 
 /* Define if building universal (internal helper macro) */
 #undef AC_APPLE_UNIVERSAL_BUILD

platforms/unix/config/configure.ac

@@ -490,6 +490,10 @@ AH_TOP([/* config.h.in -- template for config.h			-*- C -*-
 
 #ifndef __sq_config_h
 #define __sq_config_h
+
+#ifdef _FEATURES_H
+#error This file was included too late. Please make sure it is included earlier
+#endif
 ])
 
 AH_TEMPLATE([VM_DLSYM_PREFIX],[Once used to specify mangled names on Mac OS, left for documentation purposes])