Thanks to the nice OpenSolaris guys, I finally figured out that on
OpenSolaris 11, the header dependencies have changed.

--- perl.h
+++ perl.h
@@ -1192,6 +1192,8 @@
  */
 
 #if defined(I_SYSMODE) && !defined(PERL_MICRO)
+#include <sys/stat.h>
+#include <sys/vnode.h>
 #include <sys/mode.h>
 #endif