inc = include_directories('.') cpp_args = [] if get_variable('log_thread_safe', false) cpp_args += '-DLOG_MUTEX=1' endif lib_okaestne_log = static_library('okaestne-log', 'Log.cpp', include_directories: inc, cpp_args: cpp_args ) # to depend on in other projects: okaestne_log_dep = declare_dependency( link_with: lib_okaestne_log, include_directories: inc )