I that even after installing glibc-2.31 gcc still cant build static 
binaries, I just used -static flag, which shows that libc.a is not 
present, Im just new in Guix then I do not know how to create packages 
or patches, but I believe the problem is around this part of package 
spec 
https://git.savannah.gnu.org/cgit/guix.git/tree/gnu/packages/base.scm#n851

I dont know Scheme at all, but those line around line 851 seems to be 
moving or not moving the statically linked correct, will probably can 
help when I learn how to debug package specifications, but Im sending 
this email because I think its worth to someone take a look. Since some 
applications relies on gcc being able to produce static binaries, 
another improvement can be to allow gcc produce static-pie by default.. 
Let me know what you all think.

I will probably get on IRC in a few days, I just dont get online because 
I had not time to configure Tor SASL authentication on freenode... For 
now i just I want to say that im enjoyng to use Guix :)

Regards, Anonymous_