1 files changed, 17 insertions, 0 deletions

diff --git a/gl/m4/byteswap.m4 b/gl/m4/byteswap.m4
new file mode 100644
index 00000000..8058d178
--- /dev/null
+++ b/gl/m4/byteswap.m4
@@ -0,0 +1,17 @@
+# byteswap.m4 serial 5
+dnl Copyright (C) 2005, 2007, 2009-2023 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl Written by Oskar Liljeblad.
+
+AC_DEFUN([gl_BYTESWAP],
+[
+  dnl Prerequisites of lib/byteswap.in.h.
+  AC_CHECK_HEADERS([byteswap.h], [
+    GL_GENERATE_BYTESWAP_H=false
+  ], [
+    GL_GENERATE_BYTESWAP_H=true
+  ])
+])