gnu: Add chicken-srfi-13.

* gnu/packages/chicken.scm (chicken-srfi-13): New variable.

gnu/packages/chicken.scm

@@ -109,6 +109,26 @@ useful list processing procedures for construction, examining, destructuring
 and manipulating lists and pairs.")
     (license license:bsd-3)))
 
+(define-public chicken-srfi-13
+  (package
+    (name "chicken-srfi-13")
+    (version "0.3.2")
+    (source (origin
+              (method url-fetch)
+              (uri (egg-uri "srfi-13" version))
+              (sha256
+               (base32
+                "18clbmaampaxivwx9bya9fxnkzqbczhlz0kbs9bfapm77mxkwclc"))))
+    (build-system chicken-build-system)
+    (arguments '(#:egg-name "srfi-13"))
+    (native-inputs (list chicken-test))
+    (propagated-inputs (list chicken-srfi-14))
+    (home-page "https://wiki.call-cc.org/egg/srfi-13")
+    (synopsis "SRFI-13 string library for Chicken scheme")
+    (description "This package provides the SRFI-13 string library for Chicken
+scheme.")
+    (license license:bsd-3)))
+
 (define-public chicken-srfi-14
   (package
     (name "chicken-srfi-14")