diff -u liolib.c.orig liolib.c --- liolib.c.orig 2020-10-04 12:06:03.579772529 +0200 +++ liolib.c 2020-10-04 12:12:12.061843306 +0200 @@ -16,6 +16,9 @@ #include #include #include +#if defined(HAVE_UNISTD_H) +#include +#endif #include "lua.h"