---
 aclocal.m4 |    3 +++
 1 file changed, 3 insertions(+)

--- aclocal.m4
+++ aclocal.m4	2024-02-28 13:50:24.552597535 +0000
@@ -238,6 +238,9 @@ AC_CACHE_VAL(bash_cv_dup2_broken,
 #include <sys/types.h>
 #include <fcntl.h>
 #include <stdlib.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
 int
 main()
 {