[Rpm-maint] changing install arch, compatible arch from api

[Pazzo Da Legare]

Dear all,

I'm having problem with archs. I found the function rpmSetMachine
which change build_arch (of --showrc) I would like to change
programmatically (or better at compile time of my version of librpm)
other parameters: compatible build archs, install arch, install os,
compatible archs and compatible os's.
Could you please indicate which function/s should I use?
If possible, how to compile a library with archs' definitions?

TIA

pazzodalegare