diff --git a/etc/mail/Makefile b/etc/mail/Makefile
--- a/etc/mail/Makefile
+++ b/etc/mail/Makefile
@@ -241,5 +241,7 @@
 .include "Makefile.local"
 .endif
 
-# For the definition of $SHAREMODE
+# For the definition of $SHAREMODE.  Define _WITHOUT_SRCCONF to prevent this
+# including <bsd.compiler.mk>, which requires clang.
+_WITHOUT_SRCCONF=yes
 .include <bsd.own.mk>