+/// $CompilerFlags: find_compiler_flags("re2" "")
+/// $LinkerFlags: find_linker_flags("re2" "-lre2")
+
+/// $PackageInfo: require_system("arch") pkgconf re2
+/// $PackageInfo: require_system("darwin") pkg-config re2
+/// $PackageInfo: require_system("debian" "8.0") libre2-dev pkg-config
+/// $PackageInfo: require_system("ubuntu" "15.10") libre2-dev pkg-config
+