From a56c5aaddfb59d4f50fb0688e9b00b9fd8ba59eb Mon Sep 17 00:00:00 2001
From: John Darrington <john@darrington.wattle.id.au>
Date: Sun, 20 Dec 2020 22:49:20 +0100
Subject: [PATCH] configure.ac: Abort attempts to cross build in source

---
 configure.ac | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/configure.ac b/configure.ac
index d98631fcfc..d68d1bf5f8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -28,6 +28,12 @@ dnl Checks for programs.
 AC_GNU_SOURCE
 AC_PROG_CC
 gl_EARLY
+if test x"$cross_compiling" = x"yes"; then
+   if test x"$srcdir" = x"."; then
+      AC_ERROR([Cross compiling must be done out of source.])
+   fi
+fi
+
 AM_PROG_CC_C_O
 AC_LIBTOOL_WIN32_DLL
 AC_LIBTOOL_DLOPEN
-- 
2.30.2