1 files changed, 14 insertions, 0 deletions

diff --git a/gl/m4/once.m4 b/gl/m4/once.m4
new file mode 100644
index 00000000..7876a8fe
--- /dev/null
+++ b/gl/m4/once.m4
@@ -0,0 +1,14 @@
+# once.m4
+# serial 1
+dnl Copyright (C) 2024-2025 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 This file is offered as-is, without any warranty.
+
+dnl From Bruno Haible.
+
+AC_DEFUN([gl_ONCE],
+[
+  AC_REQUIRE([gl_THREADLIB])
+])