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compiling 3.7.0 from source with custom libffi path

>> I'm trying to compile python 3.7.0 from source with a custom libffi
>> path and the compiler/linker doesn't seem to pick up the right
>> version. The system libffi doesn't have the development files so I've
>> installed the latest libffi (also from source) to /opt/custom but
>> still I get
>> INFO: Could not locate ffi libs and/or headers
> Apparently the configure script uses pkg-config to locate libffi.[1] You
> should be able to get it to find your libffi by setting PKG_CONFIG_PATH
> appropriately (probably to "/opt/custom/lib/pkgconfig" ?)
> [1]: https://github.com/python/cpython/blob/v3.7.0/configure.ac#L2936

Thanks, tried it, but still no luck, exact same error message.


>> Failed to build these modules:
>> _ctypes
>> Although I compile python with --prefix=/opt/custom because that's the
>> location I'd like to install it too. So how do I tell the build system
>> where to find my custom libffi?
>> Cheers,
>> Daniel
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