gnu: Add texlive-pkfix-helper.

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

gnu/packages/tex.scm

@@ -3169,6 +3169,37 @@ PostScript files, generated by not too old dvips, and replaces them by type
 1 versions of the fonts, if possible.")
     (license license:lppl1.3+)))
 
+(define-public texlive-pkfix-helper
+  (package
+    (name "texlive-pkfix-helper")
+    (version (number->string %texlive-revision))
+    (source (texlive-origin
+             name version
+             (list "doc/man/man1/pkfix-helper.1"
+                   "doc/man/man1/pkfix-helper.man1.pdf"
+                   "doc/support/pkfix-helper/"
+                   "scripts/pkfix-helper/")
+             (base32
+              "0vq52g65an1v9g0kdhsy0xpsf1hj69gl4cr5aq1m816i8ahhzxxy")))
+    (outputs '("out" "doc"))
+    (build-system texlive-build-system)
+    (arguments (list #:link-scripts #~(list "pkfix-helper")))
+    (inputs (list perl))
+    (home-page "https://ctan.org/pkg/pkfix-helper")
+    (synopsis "Make PostScript files accessible to pkfix")
+    (description
+     "Pkfix is a useful utility for replacing resolution-dependent bitmapped
+fonts in a dvips-produced PostScript file with the corresponding
+resolution-independent vector fonts.  Unfortunately, @command{pkfix} needs to
+parse certain PostScript comments that appear only in files produced by dvips
+versions later than 5.58 (circa 1996); it fails to work on PostScript files
+produced by older versions of dvips.  Pkfix-helper is a program that attempts
+to insert newer-dvips comments into an older-dvips PostScript file, thereby
+making the file suitable for processing by @command{pkfix}.
+@command{pkfix-helper} can sometimes process documents fully autonomously but
+does require the user to verify and, if needed, correct its decisions.")
+    (license license:lppl1.3c)))
+
 (define-public texlive-tex-ini-files
   (package
     (name "texlive-tex-ini-files")