cmake HAVE_UNISTD examples

ZDoom/gzdoom libraries/ZMusic/thirdparty/libxmp/CMakeLists.txt :101 

target_compile_definitions(libxmp PRIVATE -DHAVE_DIRENT=1 -DHAVE_UNISTD=1)

glKarin/com.n0n3m4.diii4a Q3E/src/main/jni/gzdoom/libraries/ZMusic/thirdparty/libxmp/CMakeLists.txt :101 

target_compile_definitions(libxmp PRIVATE -DHAVE_DIRENT=1 -DHAVE_UNISTD=1)