if bytes.HasPrefix(buf, magic) {
			return true
		}
	}
	return false
}

// cCompilerEnv returns environment variables to set when running the
// C compiler. This is needed to disable escape codes in clang error
// messages that confuse tools like cgo.
func (b *Builder) cCompilerEnv() []string {
	return []string{"TERM=dumb"}
}

// mkAbs returns an absolute path corresponding to

	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

	defaultldso = os.Getenv("GO_LDSO")