Compiling gcc-3.4.6 on x86_64 stubs-32.h missing -m32 ?

[Marc Weber]

Hi. 
I'd like to compile gcc on nixos on a x86_64 system.
However somwhere a -m32 flag drops in which seem to cause a requirement
on stubs-32.h (glibc) which isn't there.

Do you know what might causing this / how to configure the gcc build
propberly?

build/gcc/libgcc.mk
contains some -32 flags - is this the right place to look at?

Sincerly
Marc Weber