#elif defined(__OpenBSD__) || (defined(__FreeBSD__) && __FreeBSD__ > 2) || defined(__DragonFly__)
-# include OPENSSL_UNISTD
+# include <unistd.h>
int OPENSSL_issetugid(void)
{
#else
-# include OPENSSL_UNISTD
+# include <unistd.h>
# include <sys/types.h>
# if defined(__GLIBC__) && defined(__GLIBC_PREREQ)