Build FFmpeg with openh264

[grill2010]

First of all I'm pretty new to FFmpeg so please forgive me the maybe dumb questions.
I'm currently trying to build my own version of FFmpeg for Windows x86 and Windows x64 inspired by your build scripts because they are LGPL compliant.

My first question is are the generated libs and FFmpeg executable suitable for x86 and x64 or do I have to build it somehow differently?

I tried your build scripts on Ubuntu 16 and they are working, everything gets build correctly and I have all the libs and the FFmpeg.exe. However as the title already says I want to build a FFmpeg version with the openh264 codec by cisco to avoid the royalty issue with MPEG LA, as far as I have understood you can build FFmpeg with the flag --enable-libopenh264 and somehow you have to link to the openh264 libs. Do you have any experience with this and do you know if we can then use openh264 with FFmpeg autogen?

I have already posted a related question on stackoverflow. Thank you for your help.