/** Loads a build file. If opts is not null, it is used to configure any
packages loaded from this file. If all is true, external packages are also
configured. */
void load_build_file(const Msp::FS::Path &, const Config::InputOptions *opts = 0, bool all = false);
/** Loads a build file. If opts is not null, it is used to configure any
packages loaded from this file. If all is true, external packages are also
configured. */
void load_build_file(const Msp::FS::Path &, const Config::InputOptions *opts = 0, bool all = false);