gnu: Add texlive-latex-jknapltx.

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

gnu/packages/tex.scm

@@ -1948,6 +1948,44 @@ is needed.  Keywords, comments and strings can be typeset using different
 styles.  Support for @code{hyperref} is provided.")
     (license license:lppl1.3+)))
 
+(define-public texlive-latex-jknapltx
+  (package
+    (name "texlive-latex-jknapltx")
+    (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/jknapltx"))
+                    (revision %texlive-revision)))
+              (sha256
+               (base32
+                "0m034x72f2g07icr50gacyxfb9g1lz2rmqh4kqr1qjb421x2kds9"))))
+    (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/jknapltx")))
+           (mkdir-p target)
+           (copy-recursively (assoc-ref %build-inputs "source") target)
+           #t))))
+    (home-page "http://www.ctan.org/pkg/jknappen")
+    (synopsis "Miscellaneous packages by Joerg Knappen")
+    (description
+     "This package provides miscellaneous macros by Joerg Knappen, including:
+represent counters in greek; Maxwell's non-commutative division;
+@code{latin1jk}, @code{latin2jk} and @code{latin3jk}, which are
+@code{inputenc} definition files that allow verbatim input in the respective
+ISO Latin codes; blackboard bold fonts in maths; use of RSFS fonts in maths;
+extra alignments for @code{\\parboxes}; swap Roman and Sans fonts;
+transliterate semitic languages; patches to make (La)TeX formulae embeddable
+in SGML; use maths minus in text as appropriate; simple Young tableaux.")
+    (license license:gpl2)))
+
 (define texlive-texmf
   (package
    (name "texlive-texmf")