gnu: Add texlive-xcjk2uni.

* gnu/packages/tex.scm (texlive-xcjk2uni): New variable.

gnu/packages/tex.scm

@@ -22945,6 +22945,51 @@ for the user.")
 
 (define-deprecated-package texlive-latex-hycolor texlive-hycolor)
 
+(define-public texlive-xcjk2uni
+  (package
+    (name "texlive-xcjk2uni")
+    (version (number->string %texlive-revision))
+    (source (texlive-origin
+             name version
+             (list "doc/latex/xcjk2uni/"
+                   "source/latex/xcjk2uni/"
+                   "tex/latex/xcjk2uni/")
+             (base32
+              "1vjp47ngrirrvbnk4vnm5lbysj3qlbwxbfc1szc22gaikm52ggaq")))
+    (outputs '("out" "doc"))
+    (build-system texlive-build-system)
+    (arguments
+     (list
+      #:phases
+      #~(modify-phases %standard-phases
+          (add-before 'build 'copy-ctxdocstrip.tex
+            ;; There's a circular dependency between this package (where
+            ;; `ctex' should be a native input) and `ctex' (where this package
+            ;; is a propagated input).  To work around this, install the
+            ;; specific "ctxdocstrip.tex" file from `ctex' in the build
+            ;; directory and set TEXINPUTS variable accordingly so the process
+            ;; can find it.
+            (lambda* (#:key inputs #:allow-other-keys)
+              (install-file (search-input-file inputs
+                                               "tex/generic/ctex/ctxdocstrip.tex")
+                            "build/")
+              (setenv "TEXINPUTS" (string-append (getcwd) "/build:")))))))
+    (native-inputs
+     (list (texlive-origin
+            "ctxdocstrip.tex" (number->string %texlive-revision)
+            (list "tex/generic/ctex/ctxdocstrip.tex")
+            (base32
+             "154v2d6wfzhfg654nlh2apy9zr78d09rkimymyjqpxymkpbk8lli"))))
+    (home-page "https://ctan.org/pkg/xcjk2uni")
+    (synopsis "Convert CJK characters to Unicode, in pdfTeX")
+    (description
+     "The package provides commands to convert CJK characters to Unicode in
+non-UTF-8 encoding; it provides hooks to support hyperref in producing correct
+bookmarks.  The bundle also provides @code{/ToUnicode} mapping file(s) for
+a CJK subfont; these can be used with the cmap package, allowing searches of,
+and cut-and-paste operations on a PDF file generated by pdfTeX.")
+    (license license:lppl1.3c)))
+
 (define-public texlive-xcolor
   (package
     (name "texlive-xcolor")