How is policy.31 created from modules under /usr/share/selinux

Hi All  ,

Good Morning .

I am following the SELINUX NOTEBOOK & trying the same at my end .

- The refpolicy modules are copied at /usr/share/selinux/refpolicy
   i can see around 400+ modules there .
   But can senior member' s please help me understand how is the
   /etc/selinux/refpolicy/policy/policy.31  created using the modules
available at
   /usr/share/selinux
   The command i followed :
                $ make install-src
                $ make conf
                $ make load ( tried even $ make install )
                $ make install-headers


- This can help me to debug an issue where i am trying to get selinux
of my custom
   distro where all the make command are successfully executed but the policy.31
   is not getting created

- I can even see the "include" folder also getting created for make
install-headers

Any pointers will be helpful or please let me know if i am missing any
aspect here .

Thanks ,
Ashish.