dnl Allow configure to specify a specific binary
dnl 1: Environment variable
dnl 2: binary name
dnl 3: optional list of alternatives
AC_DEFUN([QUILT_COMPAT_PROG_PATH],[
m4_define([internal_$2_cmd],[esyscmd(ls compat/$2.in 2>/dev/null)])
AC_ARG_WITH($2, AC_HELP_STRING(
[--with-$2], [name of the $2 executable to use]
m4_if(internal_$2_cmd,[],[],[ (or 'none'
to use an internal mechanism)])),
[
if test ! x"$withval" = xnone; then
$1="$withval"
AC_MSG_NOTICE([Using $2 executable $$2])
COMPAT_SYMLINKS="$COMPAT_SYMLINKS $2"
fi
],[
m4_if([$3],[],[
AC_PATH_PROGS($1,$2,,$PATH:$4)
],[
AC_PATH_PROG($1,$3,,$PATH:$4)
])
m4_if([$4],[],[],[
if test -n "$$1"; then
as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
for dir in "$4"; do
if test "`dirname $$1`" = "$dir"; then
COMPAT_SYMLINKS="$COMPAT_SYMLINKS $2"
break
fi
done
IFS="$as_save_IFS"
fi
])
])
if test -z "$$1"; then
m4_if(internal_$2_cmd,[],[
AC_MSG_ERROR([Please specify the location of $2 with the option '--with-$2'])
],[
AC_MSG_WARN([Using internal $2 mechanism. Use option '--with-$2' to override])
COMPAT_PROGRAMS="$COMPAT_PROGRAMS $2"
$1=$2
INTERNAL_$1=1
])
fi
AC_SUBST($1)
])
