@@ -110,10 +110,19 @@
 	if (!(cond)) {							\
 		fprintf(stderr, "Failed to ensure condition in "	\
 		    __FILE__ ":%d:\n" #cond "\n", __LINE__);		\
 		abort();						\
 	}
+
+#if __STDC_VERSION__ >= 201112L
+# /* C11 compiler, but old libc */
+# ifndef static_assert
+#  define static_assert _Static_assert
+# endif
+#else
+# define static_assert assert
+#endif
 
 #if !defined(_WIN32) && !defined(__DJGPP__)
 # define OF_PATH_DELIMITER '/'
 # define OF_PATH_DELIMITER_STRING @"/"
 # define OF_IS_PATH_DELIMITER(c) (c == '/')