gnu: Add texlive-latex-ucs.

* gnu/packages/tex.scm (texlive-latex-ucs): New variable.

gnu/packages/tex.scm

@@ -2483,6 +2483,46 @@ lasy font set and other odds and ends.  The wasysym package implements an easy
 to use interface for these symbols.")
     (license license:lppl)))
 
+(define-public texlive-latex-ucs
+  (package
+    (name "texlive-latex-ucs")
+    (version (number->string %texlive-revision))
+    (source (origin
+              (method svn-fetch)
+              (uri (svn-reference
+                    (url (string-append "svn://www.tug.org/texlive/tags/"
+                                        %texlive-tag "/Master/texmf-dist/"
+                                        "/tex/latex/ucs"))
+                    (revision %texlive-revision)))
+              (file-name (string-append name "-" version "-checkout"))
+              (sha256
+               (base32
+                "0rrxwi60wmz5dfjifl4fwk66plf7wix85qnhfv4ylvmj6qi6hw37"))))
+    (build-system trivial-build-system)
+    (arguments
+     `(#:modules ((guix build utils))
+       #:builder
+       (begin
+         (use-modules (guix build utils))
+         (let ((target (string-append (assoc-ref %outputs "out")
+                                      "/share/texmf-dist/tex/latex/ucs")))
+           (mkdir-p target)
+           (copy-recursively (assoc-ref %build-inputs "source") target)
+           #t))))
+    (home-page "http://www.ctan.org/pkg/ucs")
+    (synopsis "Extended UTF-8 input encoding support for LaTeX")
+    (description
+     "The bundle provides the @code{ucs} package, and @code{utf8x.def},
+together with a large number of support files.  The @code{utf8x.def}
+definition file for use with @code{inputenc} covers a wider range of Unicode
+characters than does @code{utf8.def} in the LaTeX distribution.  The package
+provides facilities for efficient use of its large sets of Unicode characters.
+Glyph production may be controlled by various options, which permits use of
+non-ASCII characters when coding mathematical formulae.  Note that the bundle
+previously had an alias “unicode”; that alias has now been withdrawn, and no
+package of that name now exists.")
+    (license license:lppl1.3+)))
+
 (define texlive-texmf
   (package
    (name "texlive-texmf")