build: reconfigure automatically if configure.ac changes

diff --git a/Makefile b/Makefile
index 88a76a398ce74cc4cf9e2821118d15a50532552e..f4e8fac4915850c0c5bfdfcd03bbe6d417871646 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -2158,6 +2158,18 @@ configure: configure.ac GIT-VERSION-FILE
        autoconf -o $@ $<+ && \
        $(RM) $<+
 
+ifdef AUTOCONFIGURED
+config.status: configure
+       $(QUIET_GEN)if test -f config.status; then \
+         ./config.status --recheck; \
+       else \
+         ./configure; \
+       fi
+reconfigure config.mak.autogen: config.status
+       $(QUIET_GEN)./config.status
+.PHONY: reconfigure # This is a convenience target.
+endif
+
 XDIFF_OBJS += xdiff/xdiffi.o
 XDIFF_OBJS += xdiff/xprepare.o
 XDIFF_OBJS += xdiff/xutils.o