--- configure	2026-02-25 12:04:04
+++ configure	2026-03-28 14:22:11
@@ -5019,7 +5019,7 @@
 esac
 
 # FIXME: Make out-of-tree builds work.
-CPPFLAGS="$CPPFLAGS -Iinclude"
+CPPFLAGS="-Iinclude $CPPFLAGS"
 CPPFLAGS="$CPPFLAGS -D_REENTRANT"
 
 libxmp_VERSION_MAJOR=4