1 files changed, 14 insertions, 0 deletions

diff --git a/gl/m4/sha256.m4 b/gl/m4/sha256.m4
new file mode 100644
index 0000000..4d1d1dd
--- /dev/null
+++ b/gl/m4/sha256.m4
@@ -0,0 +1,14 @@
+# sha256.m4 serial 8
+dnl Copyright (C) 2005, 2008-2023 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.
+
+AC_DEFUN([gl_SHA256],
+[
+  dnl Prerequisites of lib/sha256.c.
+  AC_REQUIRE([gl_BIGENDIAN])
+
+  dnl Determine HAVE_OPENSSL_SHA256 and LIB_CRYPTO
+  gl_CRYPTO_CHECK([SHA256])
+])