commit https://github.com/vim/vim/commit/4c7bb12c82914307e6bbb73d95cfb3ba7189813a Author: Bram Moolenaar <Bram@vim.org> Date: Tue Dec 29 20:32:23 2015 +0100 patch 7.4.997 Problem: "make shadow" was sometimes broken. Solution: Add a test for it. (James McCoy, closes https://github.com/vim/vim/issues/520)

#! /bin/sh
#
# which.sh -- find where an executable is located.  It's here because the
# "which" command is not supported everywhere.  Used by Makefile.

IFS=":"
for ac_dir in $PATH; do
	if test -f "$ac_dir/$1"; then
		echo "$ac_dir/$1"
		break
	fi
done