https://bugs.gentoo.org/969567
https://github.com/libvips/libvips/pull/4836
https://github.com/libvips/libvips/issues/4835
--- a/libvips/include/vips/memory.h
+++ b/libvips/include/vips/memory.h
@@ -42,5 +42,5 @@
 	{ \
 		if (S) { \
-			(void) F((S)); \
+			(void) (F((S))); \
 			(S) = 0; \
 		} \