From 0929ef213d374b8165e6d9e06ec292a5bcb77197 Mon Sep 17 00:00:00 2001
From: Jeroen Ooms <jeroenooms@gmail.com>
Date: Thu, 25 Jan 2024 21:34:06 +0100
Subject: [PATCH] Fix build for arm64 (#50)

---
 src/Makevars.ucrt | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/Makevars.ucrt b/src/Makevars.ucrt
index 1a2e101..b511345 100644
--- a/src/Makevars.ucrt
+++ b/src/Makevars.ucrt
@@ -1,2 +1,8 @@
-CRT=-ucrt
-include Makevars.win
+# Used on rtools43 and up
+PKG_LIBS = $(shell pkg-config --libs gmpxx mpfr)
+
+# Fallback for older rtools without pkgconfig
+ifeq (,$(PKG_LIBS))
+  CRT=-ucrt
+  include Makevars.win
+endif