How to ensure methods are set in my GNUstep build

[Gustavo Tavares]

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