1 files changed, 21 insertions, 0 deletions

diff --git a/gl/m4/musl.m4 b/gl/m4/musl.m4
new file mode 100644
index 00000000..0d4de892
--- /dev/null
+++ b/gl/m4/musl.m4
@@ -0,0 +1,21 @@
+# musl.m4
+# serial 4
+dnl Copyright (C) 2019-2024 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.
+
+# Test for musl libc, despite the musl libc authors don't like it
+# <https://wiki.musl-libc.org/faq.html>
+# <https://lists.gnu.org/archive/html/bug-gnulib/2018-02/msg00079.html>.
+# From Bruno Haible.
+
+AC_DEFUN_ONCE([gl_MUSL_LIBC],
+[
+  AC_REQUIRE([AC_CANONICAL_HOST])
+  case "$host_os" in
+    *-musl* | midipix*)
+      AC_DEFINE([MUSL_LIBC], [1], [Define to 1 on musl libc.])
+      ;;
+  esac
+])