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diff --git a/apps/aux/system.scm b/apps/aux/system.scm
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+;;; Harmonic Flow web site
+
+(define-module (apps aux system)
+  #:export (path-join))
+
+
+;;;
+;;; Procedures.
+;;;
+
+(define (path-join . parts)
+  "Return a system path composed of the given PARTS.
+
+   PARTS (strings)
+     A succession of strings representing parts of a file system path.
+
+     To indicate an absolute path, use an empty string as the first
+     part. For example:
+
+     (path-join '' 'docs' 'manual')
+     => '/docs/manual'
+
+     To end the path with a slash, use an empty string as the last
+     part. For example:
+
+     (path-join '' 'docs' 'manual' '')
+     => '/docs/manual/'
+
+   RETURN VALUE (string)
+     A string representing a file system path."
+  (cond ((equal? parts '("")) "/") ; Root directory
+	(else (string-join parts file-name-separator-string))))