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Bug 5403

Summary: Project fails to build with CMake when DirectFB backend is enabled
Product: SDL Reporter: Simon Zeni <simon>
Component: buildAssignee: Sam Lantinga <slouken>
Status: NEW --- QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 CC: flibitijibibo
Version: 2.0.12   
Hardware: x86_64   
OS: Linux   

Description Simon Zeni 2020-12-18 14:46:37 UTC 
On Alpinelinux, where the DirectFB backend is enabled in the package itself (https://git.alpinelinux.org/aports/tree/community/sdl2/APKBUILD#n53), several CMake projects that uses SDL2's SDL2Targets.cmake will fail to build with the following error

In file included from /home/simon/dev/FNA3D/src/FNA3D_Driver_OpenGL.c:33:
/usr/include/SDL2/SDL_syswm.h:80:10: fatal error: directfb.h: No such file or directory
   80 | #include <directfb.h>
      |          ^~~~~~~~~~~~
compilation terminated.
make[2]: *** [CMakeFiles/FNA3D.dir/build.make:108: CMakeFiles/FNA3D.dir/src/FNA3D_Driver_OpenGL.c.o] Error 1
make[2]: *** Waiting for unfinished jobs....
In file included from /home/simon/dev/FNA3D/src/FNA3D_Driver_Vulkan.c:36:
/usr/include/SDL2/SDL_syswm.h:80:10: fatal error: directfb.h: No such file or directory
   80 | #include <directfb.h>
      |          ^~~~~~~~~~~~
compilation terminated.

The build is successful if SDL2 is found through pkgconfig.