gnu: Add sbcl-find-port, cl-find-port, and ecl-find-port.

* gnu/packages/lisp.scm (sbcl-find-port, cl-find-port, ecl-find-port): New
variables.

gnu/packages/lisp.scm

@@ -5288,3 +5288,36 @@ various levels and mix text with expressions.")
 
 (define-public ecl-log4cl
   (sbcl-package->ecl-package sbcl-log4cl))
+
+(define-public sbcl-find-port
+  (let ((commit "00c96a25af93a0f8681d34ec548861f2d7485478")
+        (revision "1"))
+    (package
+      (name "sbcl-find-port")
+      (build-system asdf-build-system/sbcl)
+      (version "0.1")
+      (home-page "https://github.com/eudoxia0/find-port")
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url home-page)
+               (commit commit)))
+         (file-name (git-file-name name version))
+         (sha256
+          (base32
+           "0d6dzbb45jh0rx90wgs6v020k2xa87mvzas3mvfzvivjvqqlpryq"))))
+      (native-inputs
+       `(("fiveam" ,sbcl-fiveam)))
+      (inputs
+       `(("sbcl-usocket" ,sbcl-usocket)))
+      (synopsis "Find open ports programmatically in Common Lisp")
+      (description "This is a small Common Lisp library that finds an open
+port within a range.")
+      (license license:expat))))
+
+(define-public cl-find-port
+  (sbcl-package->cl-source-package sbcl-find-port))
+
+(define-public ecl-find-port
+  (sbcl-package->ecl-package sbcl-find-port))