diff -ur '--exclude=*.o' opensmtpd-7.4.0p1.orig/openbsd-compat/getdtablecount.c opensmtpd-7.4.0p1/openbsd-compat/getdtablecount.c
--- a/openbsd-compat/getdtablecount.c	2024-04-01 07:25:41.230753002 +0000
+++ b/openbsd-compat/getdtablecount.c	2024-04-01 07:27:23.556124378 +0000
@@ -20,6 +20,7 @@
 
 #include <glob.h>
 #include <unistd.h>
+#include <stdio.h>
 
 void fatal(const char *, ...);
 void fatalx(const char *, ...);