From b1a116e32d623f5a6109df1e86eaf014a7fab4c4 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Sat, 12 Jun 2021 11:49:54 +0000
Subject: build system: configure: config_ccenv(): require --sysroot when
 cross-compiling.

---
 configure | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/configure b/configure
index d2283e0..e324f8d 100755
--- a/configure
+++ b/configure
@@ -816,8 +816,17 @@ config_ccenv()
 	output_section_break
 	ccenv_set_native_variables
 
+	# require --sysroot when cross-compiling
+	if [ "$mb_cchost" != "$mb_native_cchost" ] && [ -z "$mb_sysroot" ]; then
+		error_msg ' !!'
+		error_msg "$mb_package: --sysroot is required when cross-compiling."
+		exit 2
+	fi
+
+	# re-generate Makefile.tmp
 	output_section_break
 	config_copy
+
 }
 
 config_custom_cfgdefs()
-- 
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