diff --git a/Makefile.inc1 b/Makefile.inc1
index 56a73dad0653..55e391d3fe64 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -135,7 +135,8 @@ TEST_SYSTEM_COMPILER_VARS= \
 	MK_CROSS_COMPILER MK_CLANG_BOOTSTRAP MK_GCC_BOOTSTRAP \
 	WANT_COMPILER_TYPE WANT_COMPILER_VERSION WANT_COMPILER_VERSION_FILE \
 	WANT_COMPILER_FREEBSD_VERSION WANT_COMPILER_FREEBSD_VERSION_FILE \
-	CC COMPILER_TYPE COMPILER_VERSION COMPILER_FREEBSD_VERSION
+	CC COMPILER_TYPE COMPILER_FEATURES COMPILER_VERSION \
+	COMPILER_FREEBSD_VERSION
 test-system-compiler: .PHONY
 .for v in ${TEST_SYSTEM_COMPILER_VARS}
 	${_+_}@printf "%-35s= %s\n" "${v}" "${${v}}"
@@ -153,9 +154,11 @@ test-system-compiler: .PHONY
 .if !defined(X_COMPILER_TYPE)
 CROSSENV+=	COMPILER_VERSION=${COMPILER_VERSION} \
 		COMPILER_TYPE=${COMPILER_TYPE} \
+		COMPILER_FEATURES=${COMPILER_FEATURES} \
 		COMPILER_FREEBSD_VERSION=${COMPILER_FREEBSD_VERSION}
 .else
 CROSSENV+=	COMPILER_VERSION=${X_COMPILER_VERSION} \
+		COMPILER_FEATURES=${X_COMPILER_FEATURES} \
 		COMPILER_TYPE=${X_COMPILER_TYPE} \
 		COMPILER_FREEBSD_VERSION=${X_COMPILER_FREEBSD_VERSION}
 .endif