gnu: Add texlive-latex-amsmath.

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

gnu/packages/tex.scm

@@ -1223,6 +1223,34 @@ this bundle for use independent of ConTeXt.")
     ;; GPL version 2 only
     (license license:gpl2)))
 
+(define-public texlive-latex-amsmath
+  (package
+    (name "texlive-latex-amsmath")
+    (version (number->string %texlive-revision))
+    (source (origin
+              (method svn-fetch)
+              (uri (texlive-ref "latex" "amsmath"))
+              (sha256
+               (base32
+                "178ywjpdlv78qmfzqdyn6gy14620zjsn2q9wap76fbr9s4hw6dba"))))
+    (build-system texlive-build-system)
+    (arguments '(#:tex-directory "latex/amsmath"))
+    (home-page "http://www.ctan.org/pkg/amsmath")
+    (synopsis "AMS mathematical facilities for LaTeX")
+    (description
+     "This is the principal package in the AMS-LaTeX distribution.  It adapts
+for use in LaTeX most of the mathematical features found in AMS-TeX; it is
+highly recommended as an adjunct to serious mathematical typesetting in LaTeX.
+When amsmath is loaded, AMS-LaTeX packages @code{amsbsyamsbsy} (for bold
+symbols), @code{amsopnamsopn} (for operator names) and
+@code{amstextamstext} (for text embedded in mathematics) are also loaded.
+This package is part of the LaTeX required distribution; however, several
+contributed packages add still further to its appeal; examples are
+@code{empheqempheq}, which provides functions for decorating and highlighting
+mathematics, and @code{ntheoremntheorem}, for specifying theorem (and similar)
+definitions.")
+    (license license:lppl1.3c+)))
+
 (define texlive-texmf
   (package
    (name "texlive-texmf")