rpm/canongnu.diff

--- CMakeLists.txt.orig	2023-10-13 12:38:26.953411554 +0000
+++ CMakeLists.txt	2023-10-13 12:40:11.057239934 +0000
@@ -144,7 +144,7 @@ function(makemacros)
 
 	set(RPMCANONVENDOR ${host_vendor})
 	set(RPMCANONOS ${host_os})
-	set(RPMCANONGNU -gnu)
+	set(RPMCANONGNU -gnu CACHE STRING "gnu os suffix")
 
 	if (ENABLE_CUTF8)
 		set(C_LOCALE "C.UTF-8")