diff --git a/libc/include/limits.h b/libc/include/limits.h
index c32ec46aae..c4ac0d9f12 100644
--- a/libc/include/limits.h
+++ b/libc/include/limits.h
@@ -11,12 +11,6 @@ __BEGIN_DECLS
 //        glibc seems to only define numerical
 //        and posix constants
 
-#if defined __GNUC__ && !defined _GCC_LIMITS_H_
-	#include_next <limits.h>
-#else
-	#error "unsupported compiler"
-#endif
-
 __END_DECLS
 
 #endif
diff --git a/libc/include/sys/mman.h b/libc/include/sys/mman.h
index 48292cf377..ee79bc85e9 100644
--- a/libc/include/sys/mman.h
+++ b/libc/include/sys/mman.h
@@ -12,9 +12,10 @@ __BEGIN_DECLS
 #define PROT_READ	0x04
 #define PROT_WRITE	0x08
 
-#define MAP_FIXED	0x01
-#define MAP_PRIVATE	0x02
-#define MAP_SHARED	0x04
+#define MAP_FIXED		0x01
+#define MAP_PRIVATE		0x02
+#define MAP_SHARED		0x04
+#define MAP_ANONYMOUS	0x08
 
 #define MS_ASYNC		0x01
 #define MS_INVALIDATE	0x02