I am trying to complile staf 3436 version with latest perl 5.26.1 from active state, i am getting following error:

/localdisk/STAF3426/src/staf/lang/perl/perl520/../STAFPerlGlue.cpp:11:20: fatal error: EXTERN.h: No such file or directory
#include "EXTERN.h"

How to resolve this?