prereq-build: check for "bc" (#13767)

bc is required by the kernel to compute timeconsts files, add bc to the
list of prereq to build OpenWrt.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37108 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/include/prereq-build.mk b/include/prereq-build.mk
index 59ea7ef..dadce81 100644 (file)
--- a/include/prereq-build.mk
+++ b/include/prereq-build.mk
@@ -183,3 +183,7 @@ endef
 $(eval $(call Require,getopt-extended, \
        Please install an extended getopt version that supports --long \
 ))
+
+$(eval $(call RequireCommand,bc, \
+       Please install bc. \
+))