set(inc "inc") if(PS1_BUILD) set(src "ps1/src/init.c") set(inc ${inc} "ps1/inc") elseif(SDL1_2_BUILD) set(src "sdl-1.2/src/system.c") set(inc ${inc} "sdl-1.2/inc") endif() add_library(system ${src}) target_include_directories(system PUBLIC ${inc}) target_link_libraries(system PRIVATE gfx sfx)