dnl VIM_MISSING_PROG(NAME, PROGRAM, DIRECTORY, TEST_DIRECTORY)
dnl The program must properly implement --version.
dnl vimhack: CD to a directory to avoid current
dnl vimhack: configuration alteration by poorly
dnl vimhack: written scripts

AC_DEFUN(VIM_MISSING_PROG,
[AC_MSG_CHECKING(for working $2)
# Run test in a subshell; some versions of sh will print an error if
# an executable is not found, even if stderr is redirected.
# Redirect stdin to placate older versions of autoconf.  Sigh.
vim_old_pwd=`pwd`
cd $4
if ($2 --version) < /dev/null > /dev/null 2>&1; then
   $1=$2
   AC_MSG_RESULT(found)
else
   $1="$3/missing $2"
   AC_MSG_RESULT(missing)
fi
cd $vim_old_pwd 
AC_SUBST($1)])