}
		goextlinkenabled = b
	}

	goexperiment = os.Getenv("GOEXPERIMENT")
	// TODO(mdempsky): Validate known experiments?

	gogcflags = os.Getenv("BOOT_GO_GCFLAGS")
	goldflags = os.Getenv("BOOT_GO_LDFLAGS")

	defaultcc = compilerEnv("CC", "")
	defaultcxx = compilerEnv("CXX", "")

	b = os.Getenv("PKG_CONFIG")
	if b == "" {
		b = "pkg-config"
	}
	defaultpkgconfig = b