diff -ru cyrus-sasl-2.1.28.orig/include/Makefile.in cyrus-sasl-2.1.28/include/Makefile.in
--- cyrus-sasl-2.1.28.orig/include/Makefile.in	2022-02-18 22:53:55.000000000 +0100
+++ cyrus-sasl-2.1.28/include/Makefile.in	2024-01-14 22:34:08.569689272 +0100
@@ -802,6 +802,7 @@
 
 makemd5$(BUILD_EXEEXT) $(makemd5_OBJECTS): CC=$(CC_FOR_BUILD)
 makemd5$(BUILD_EXEEXT) $(makemd5_OBJECTS): CFLAGS=$(CFLAGS_FOR_BUILD)
+makemd5$(BUILD_EXEEXT) $(makemd5_OBJECTS): CPPFLAGS=$(CPPFLAGS_FOR_BUILD)
 makemd5$(BUILD_EXEEXT): LDFLAGS=$(LDFLAGS_FOR_BUILD)
 
 md5global.h: makemd5$(BUILD_EXEEXT) Makefile