X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ian/git?a=blobdiff_plain;f=configure.ac;h=e56fee9a188399f01a9643912ca48fa12887718f;hb=e0d6429b6d8ed4c07f1dec7adeeab6984bb5c56c;hp=4557f9539c394ee4f87e3b63e8cb8629e0f8ccdc;hpb=6bdebd83b99b5078fa224236bec2babd9b6a5f54;p=subdirmk.git

diff --git a/configure.ac b/configure.ac
index 4557f95..e56fee9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -36,8 +36,16 @@ m4_define([SUBDIRSMK_SUBDIRS],
 [m4_map_args_w([$1],[_SUBDIRSMK_SUBDIR(],[/)])])dnl
 
 AC_CONFIG_FILES([subdirs.mk:subdirs.mk.tmp Subdir.mk:Subdir.mk.tmp],[],
-[echo 'running subdirmk-setup'
-'$srcdir'/build-aux/subdirmk-setup --srcdir '$srcdir' $subdirsmk_subdirs])
+[
+subdirsmk_need_prep=false
+AS_IF([\$ac_need_defaults],
+[subdirsmk_need_prep=true],[
+AS_CASE([" \$ac_config_targets "],[*" subdirs.mk "*],
+[subdirsmk_need_prep=true])])
+AS_IF([\$subdirsmk_need_prep],[
+ echo 'running subdirmk-setup'
+ '$srcdir'/build-aux/subdirmk-setup --srcdir '$srcdir' $subdirsmk_subdirs
+])])
 
 m4_define([_SUBDIRSMK_SUBDIR],
 [subdirsmk_subdirs="$subdirsmk_subdirs '$1'"