diff --git a/share/mk/bsd.compat.mk b/share/mk/bsd.compat.mk
--- a/share/mk/bsd.compat.mk
+++ b/share/mk/bsd.compat.mk
@@ -115,11 +115,17 @@
 LIB${_LIBCOMPAT}_OBJTOP?=	${OBJTOP}/obj-lib${_libcompat}
 
 LIB${_LIBCOMPAT}CFLAGS+=	${LIB${_LIBCOMPAT}CPUFLAGS} \
+				-DCOMPAT_LIBCOMPAT=\"${_LIBCOMPAT}\" \
+				-DCOMPAT_libcompat=\"${_libcompat}\" \
+				-DCOMPAT_LIB${_LIBCOMPAT} \
 				--sysroot=${WORLDTMP} \
 				${BFLAGS}
 
 LIB${_LIBCOMPAT}LDFLAGS+=	-L${WORLDTMP}/usr/lib${_libcompat}
 
+LIB${_LIBCOMPAT}WMAKEFLAGS+=	COMPAT_LIBCOMPAT=${_LIBCOMPAT} \
+				COMPAT_libcompat=${_libcompat}
+
 LIB${_LIBCOMPAT}WMAKEENV+=	MACHINE=${LIB${_LIBCOMPAT}_MACHINE}
 LIB${_LIBCOMPAT}WMAKEENV+=	MACHINE_ARCH=${LIB${_LIBCOMPAT}_MACHINE_ARCH}