"LIBRARY_PATH",       // allow override of non-standard static library paths
	"C_INCLUDE_PATH",     // allow override non-standard include paths
	"CC",                 // don't lose user settings when invoking cgo
	"GO_TESTING_GOTOOLS", // for gccgo testing
	"GCCGO",              // for gccgo testing
	"GCCGOTOOLDIR",       // for gccgo testing
}

// updateSum runs 'go mod tidy', 'go list -mod=mod -m all', or