Try another way

5e3387fa · Poul-Henning Kamp · 1a0d149d · 5e3387fa
Commit 5e3387fa authored Oct 04, 2017 by Poul-Henning Kamp
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vdef.h include/vdef.h +4 -1

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--- a/include/vdef.h
+++ b/include/vdef.h
@@ -131,9 +131,12 @@
 /*
 * Most of this nightmare is stolen from FreeBSD's <cdefs.h>
 */
+#ifndef __has_extension
+#  define __has_extension	0
+#endif
 #if defined(_Static_assert)
    /* Nothing, somebody already did this for us */
-#elif defined(__has_extension) && __has_extension(c_static_assert)
+#elif __has_extension(c_static_assert)
    /* Nothing, we should be fine */
 #elif (defined(__cplusplus) && __cplusplus >= 201103L) || \
       __has_extension(cxx_static_assert)