SGI IRIX, how to compile GNAT

[Carlo Pisani]

hi guys
I am looking for instructions about *HowTo* compile a modern version
of GNAT on IRIX >= 6.5.20

2016-12-10 =dev-lang/gnat-gcc-4.9.3 - success - Linux/PPC32BE
2016-12-13 =dev-lang/gnat-gcc-4.3.5 - success - Linux/PPC32BE
2017-08-24 =dev-lang/gnat-gcc-4.3.5 - failure - Linux/PPC32BE
2018-03-24 =dev-lang/gnat-gcc-4.3.5 - success - Linux/PPC32BE
2018-03-25 =dev-lang/gnat-gpl-4.3.5 - failure - Linux/PPC32BE
2018-03-27 =dev-lang/gnat-gpl-4.3.5 - failure - Linux/PPC32BE
2018-03-28 =dev-lang/gnat-gpl-4.3.5 - failure - Linux/PPC32BE
2018-04-05 =dev-lang/gnat-gcc-4.3.5 - success - Linux/PPC32BE

I have successfully done it on Linux/PPC32-be (Apple PowerMac G4),
but:
- it was very very difficult
- the recipe for Linux doesn't work for Irix

anyone?

thanks