X-Git-Url: https://git.archive.openwrt.org/?p=openwrt.git;a=blobdiff_plain;f=Makefile;h=25f60e1e545d24c66271e0cdc6c01872ec4c18bf;hp=5b966b752c9dec85fb763ba7213954315f7e4840;hb=c133c86f41a5be64876ad611debb189d5d8b479e;hpb=b155a7112aa89b751711bc563ce9e3be6ecc16a1

diff --git a/Makefile b/Makefile
index 5b966b752c..25f60e1e54 100644
--- a/Makefile
+++ b/Makefile
@@ -81,11 +81,24 @@ toolchain/%: FORCE
 	@[ -f .config ] || $(NO_TRACE_MAKE) menuconfig
 	@$< -D .config Config.in &> /dev/null
 
+.prereq: $(TOPDIR)/include/prereq.mk .pkginfo
+	@$(NO_TRACE_MAKE) -s -f $(TOPDIR)/include/prereq.mk prereq 2>/dev/null || { \
+		echo "Prerequisite check failed. Use FORCE=1 to override."; \
+		false; \
+	}
+	@touch $@
+
+prereq: .prereq FORCE
+
 download: .config FORCE
 	$(MAKE) toolchain/download
 	$(MAKE) package/download
 	$(MAKE) target/download
 
+ifeq ($(FORCE),)
+world: .prereq
+endif
+
 world: .config FORCE
 	$(MAKE) toolchain/install
 	$(MAKE) target/compile