diff --git a/configure.ac b/configure.ac
index d7c7dc0..5b6c48f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -22,7 +22,13 @@
 #
 
 # Initialize Autoconf
-AC_PREREQ([2.70])
+
+# conda-forge patch: upstream requires Autoconf 2.70, but our Windows tooling
+# only provides 2.69. As of 1.3.0, this script does not appear to rely on any
+# features introduced in 2.70, so it should be OK to hack the version
+# requirement.
+AC_PREREQ([2.69])
+
 AC_INIT([libXt], [1.3.0],
 	[https://gitlab.freedesktop.org/xorg/lib/libxt/-/issues/], [libXt])
 AC_CONFIG_SRCDIR([Makefile.am])
@@ -112,7 +118,7 @@ esac
 
 # Link with winsock if mingw target
 case $host_os in
-	*mingw*)
+	*mingw*|*msys*)
 		AC_CHECK_LIB([ws2_32],[main])
 	;;
 	*)