Only call the just-added "touch" if autoheader succeeded.

diff --git a/prepare-source.mak b/prepare-source.mak
index b54beee..8a6fd90 100644 (file)
--- a/prepare-source.mak
+++ b/prepare-source.mak
@@ -4,8 +4,7 @@ configure: configure.in aclocal.m4
        autoconf
 
 config.h.in: configure.in aclocal.m4
-       autoheader
-       touch config.h.in
+       autoheader && touch config.h.in
 
 proto.h: *.c lib/compat.c
        cat *.c lib/compat.c | awk -f mkproto.awk >proto.h.new