On Sun, Jan 27, 2013 at 01:24:46PM -0800, David Aguilar wrote:
> --- a/git-mergetool--lib.sh
> +++ b/git-mergetool--lib.sh
> @@ -1,5 +1,6 @@
>  #!/bin/sh
>  # git-mergetool--lib is a library for common merge tool functions
> +test -z "$MERGE_TOOLS_DIR" &&
>  MERGE_TOOLS_DIR=$(git --exec-path)/mergetools

The preferred pattern in Git seems to be this:

    : ${MERGE_TOOLS_DIR=$(git --exec-path)/mergetools}


John
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