Commit c4aa2a623 for imagemagick.org

commit c4aa2a623a4ffea350ff9ea1d37c6dd21523d6e7
Author: Cristy <urban-warrior@imagemagick.org>
Date:   Sun Apr 19 11:39:51 2026 -0400

    eliminate compiler warning

diff --git a/MagickCore/memory.c b/MagickCore/memory.c
index 5c5fc32e7..21a30168a 100644
--- a/MagickCore/memory.c
+++ b/MagickCore/memory.c
@@ -603,6 +603,10 @@ MagickExport void *AcquireMagickMemory(const size_t size)
 */
 MagickExport void *AcquireCriticalMemory(const size_t size)
 {
+#if !defined(STDERR_FILENO)
+#define STDERR_FILENO 2
+#endif
+
   static const char fatal_message[] =
     "ImageMagick: fatal error: unable to acquire critical memory\n";