diff -r 5fc32e4b2a8c -r 248d0b85cbda sources/basics.h
--- a/sources/basics.h	Wed Jan 27 19:01:37 2021 +0200
+++ b/sources/basics.h	Wed Jan 27 19:27:23 2021 +0200
@@ -125,4 +125,10 @@
 
 struct Exitception {};
 
+#ifdef __GNUC__
+# define GNUATTRIBUTE(X) __attribute__(X)
+#else
+# define GNUATTRIBUTE(X)
+#endif
+
 END_ZFC_NAMESPACE