How do I find the kernel config for my ROM?

I'm very happy with CM11 ported to my phone(Samsung Galaxy Ace 2). One day I bought Bluetooth keyboard. When I tried to connect it, it paired and... wat? No connection!? I thought that this ROM has some bug, so i looked at logcat. I found that there's no uhid driver and I think that developers didn't compile kernel with "CONFIG_UHID=y". I'm gonna compile new kernel. First I need to check it, but there's no /proc/config.gz. How can I check(and compile) that without it? ROM homepage: http://novafusion.pl/ EDIT: Seems like that other CM/AKOP ROM's for my device don't have uhid support(or kernel source is crap?). Keyboard works fine with Stock ROM