gitweb: fix regression when filtering out forks

diff --git a/git-difftool--helper.sh b/git-difftool--helper.sh
index 524f5ea8ab14bb44e5a8e6393e40c0ec5c1ddaa2..0594bf7ca54c6b91d5f96dd86d8962e93459d004 100755 (executable)
--- a/git-difftool--helper.sh
+++ b/git-difftool--helper.sh
@@ -49,6 +49,7 @@ launch_merge_tool () {
        fi
 
        if use_ext_cmd; then
+               export BASE
                eval $GIT_DIFFTOOL_EXTCMD '"$LOCAL"' '"$REMOTE"'
        else
                run_merge_tool "$merge_tool"