if path != "" && path[0] == '"' {
			s, err := strconv.Unquote(path)
			if err != nil {
				return ""
			}
			path = s
		}
		return path
	})
}

// findVersionElement returns the slice indices of the final version element /vN in path.
// If there is no such element, it returns -1, -1.
func findVersionElement(path string) (i, j int) {
	j = len(path)
	for i = len(path) - 1; i >= 0; i-- {

func (b *Builder) PkgconfigCmd() string {
	return envList("PKG_CONFIG", cfg.DefaultPkgConfig)[0]
}

// splitPkgConfigOutput parses the pkg-config output into a slice of flags.
// This implements the shell quoting semantics described in
// https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_02,