void set_deps(const std::string &tgt, const StringList &d);
const StringList &get_deps(const std::string &tgt) const;
const Msp::Time::TimeStamp &get_mtime() const { return mtime; }
void set_deps(const std::string &tgt, const StringList &d);
const StringList &get_deps(const std::string &tgt) const;
const Msp::Time::TimeStamp &get_mtime() const { return mtime; }