added m4 to prereq check, thanks to Gerph

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@15043 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/include/prereq-build.mk b/include/prereq-build.mk
index 0b396c83dd6278529d2469faa299d2d7029c82a9..1cdcd0f2c5db24cfc9f7d3b915ee7b4705171775 100644 (file)
--- a/include/prereq-build.mk
+++ b/include/prereq-build.mk
@@ -148,3 +148,7 @@ endef
 $(eval $(call Require,getopt-extended, \
        Please install an extended getopt version that supports --long \
 ))
+
+$(eval $(call RequireCommand,m4, \
+       Please install GNU m4 \
+))