Fragment from my .emacs to get perlbrew working under it.

emacs-perlbrew.el

;; If perlbrew is used, get PERLBREW_PATH to be used in exec-path and PATH
;; Adapted from https://gist.github.com/960214
(require 'cl)
(let ((perlbrew-init "~/.perlbrew/init"))
  (if (file-readable-p perlbrew-init)
      (dolist (line (with-temp-buffer
                      (insert-file-contents perlbrew-init)
                      (split-string (buffer-string) "\n" t)))
        (with-temp-buffer
          (insert line)
          (goto-char (point-min))
          (search-forward "export " nil t)
          (when (= (point) 8)
            (let* ((idx (search-forward "="))
                   (val (buffer-substring idx (progn (end-of-line) (point))))
                   (key (buffer-substring 8 (decf idx))))
              (if (string-match "PERLBREW_PATH" key)
                  (dolist (perlbin (parse-colon-path val))
                    (setq perlbin (substring perlbin 0 -1)) ; remove trailing /
                    (setenv "PATH" (concat perlbin ":" (getenv "PATH")))
                    (add-to-list 'exec-path perlbin)))))))))