port-sparc/55971: It is impossible to build gcc7 because of buh with GNU Fortran on SPARC32 platform

[ideafix%ideafix.name@localhost]

>Number:         55971
>Category:       port-sparc
>Synopsis:       It is impossible to build gcc7 because of buh with GNU Fortran on SPARC32 platform
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    port-sparc-maintainer
>State:          open
>Class:          support
>Submitter-Id:   net
>Arrival-Date:   Wed Feb 03 06:40:00 +0000 2021
>Originator:     Alex
>Release:        9.1 2020@4
>Organization:
URFU
>Environment:
QEMU NETBSD9.1 GENERIC SPARC
>Description:
It is impossible to build a lot of packages because system stops on:

"checking wether we are using the GNU Fortran compiler..."

I tried to add f2c (PKGSRC_COMPILER= f2c gcc) and build and install all packages with fortran in package name. Also I tried to use gfortran (PKGSRC_FORTRAN= gfortran and package installed) - no changes.

Is it a configuration problem or pkgsrc jusi unusable on PORT-SPARC? A lot of packages have a gcc7 in depends, but it is impossible to build it.
>How-To-Repeat:
just try to build gcc7
>Fix: