--- o/perl.h	2017-01-01 00:18:02.127353691 +0200
+++ o/perl.h	2017-01-01 00:18:57.717472740 +0200
@@ -3561,7 +3561,7 @@ 
 #endif
 
 #ifndef __cplusplus
-#if !(defined(WIN32) || defined(UNDER_CE) || defined(SYMBIAN))
+#if !(defined(WIN32) || defined(UNDER_CE) || defined(SYMBIAN) || defined(I_UNISTD))
 Uid_t getuid (void);
 Uid_t geteuid (void);
 Gid_t getgid (void);