No, you really can’t. For some OSS, on hardware that has an OS supported by that software, with a compiler that supports that target and the options you want, and in some cases where the OSS has been written to support those options, you can compile it. Otherwise you are just out of luck.
I don't really understand your position here. Compiler availability isn't really that big of a deal, even on obscure or proprietary platforms. Why would there be "some cases where the OSS has been written to support those options"?