Can you help me to FORCE it to NEVER be run ? Even if I have patch this to never this run.
No. I have no expertise in neither FreeBSD nor bison (nor the configure/make process of Pike for that matter).
It is POSSIBLE to build Pike on your system, so Pike itself is ok. The problem is in your build process. This process can be fixed later and you can build a 7.6.48 Pike that behaves like any other 7.6.48 Pike. This is what we typically do with other difficult platform builds like the Windows port.