Hello!
>
> I've installed GNUstep using this script from Plaurent:
> https://github.com/plaurent/gnustep-build/blob/master/ubuntu-19.10-clang-9.0-runtime-2.0/GNUstep-buildon-ubuntu1910.sh
> and have been successfully building some projects with it.
>
> For my current project, I'm encountering a build error. I was thinking it was
> a config on the GNU install—and later I thought it was something I could
> define in a Makefile—but I can't seem to work out how to solve it.
>
> The error is this:
>
> MyFile.m:130:50: error: no visible @interface for 'NSDateComponents' declares
> the selector 'valueForComponent:'
>
> I can see that the MAC_OS_VERSION and GS_API_VERSION are somehow determined
> in GSVersionMacros.h and that this determines whether to inlcude this
> NSDateComponents functionality—but I also don't know where the headers are in
> my system. Looking in /usr/GNUstep/System/ and ~/GNUstep/Library/Headers and
> I can't echo it out either.
>
> https://github.com/gnustep/libs-base/blob/fc0c0da188eb4ee2800ab9643394aa16660ef6bd/Headers/GNUstepBase/GSVersionMacros.h
>
> Would really appreciate it if someone could help me get this built :) What do
> I need to do / invoke?
>
> Thank you!
>
> Gustavo
