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-rwxr-xr-xgit-difftool--helper.sh1
1 files changed, 1 insertions, 0 deletions
diff --git a/git-difftool--helper.sh b/git-difftool--helper.sh
index 524f5ea8ab..0594bf7ca5 100755
--- 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"