From 0da1f19e0d4bfe57706a5f74de8301ae5e106381 Mon Sep 17 00:00:00 2001
From: Cheng Shao <cheng.shao@tweag.io>
Date: Sun, 24 Jan 2021 13:38:04 +0000
Subject: Respect $AR in configure script

Previously, the configure script doesn't respect $AR. This causes the
nixpkgs GHC to capture "ar" instead of the absolute nix store path of ar
in the global config.

The original patch comes from
https://github.com/input-output-hk/haskell.nix/blob/master/overlays/patches/ghc/respect-ar-path.patch.
---
 aclocal.m4 | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/aclocal.m4 b/aclocal.m4
index c63f3b8c55..3e240eaaaa 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -1235,7 +1235,8 @@ AC_SUBST([LdHasFilelist])
 # thinks that target == host so it never checks the unqualified
 # tools for Windows. See #14274.
 AC_DEFUN([FP_PROG_AR],
-[if test -z "$fp_prog_ar"; then
+[AC_SUBST(fp_prog_ar,$AR)
+if test -z "$fp_prog_ar"; then
   if test "$HostOS" = "mingw32"
   then
     AC_PATH_PROG([fp_prog_ar], [ar])
-- 
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