https://trac.macports.org/ticket/74045

--- lib/random_dev_urandom.c.orig	2026-05-10 22:46:50
+++ lib/random_dev_urandom.c	2026-05-29 10:15:02
@@ -41,6 +41,10 @@
 #include <fcntl.h>  // open
 #include <unistd.h> // close
 
+#ifndef O_CLOEXEC
+#define O_CLOEXEC 0
+#endif
+
 /* Extract entropy from /dev/urandom */
 bool
 writeRandomBytes_dev_urandom(void *target, size_t count) {