bug#51435: Fix it (unison does not build on core-updates-frozen)

[Vivien Kraus via Bug reports for GNU Guix <bug-guix@gnu.org>]

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Rekado on #guix told me that I had to create a simple texlive package
for the missing package, that’s what I did. Since I’m not familiar with
the texlive way of doing things, I’m not sure the homepage is that of
l3backend (and thus, I’m not sure of the license if it’s not), and I
need someone to review the description for the package too.

Vivien


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From 093b913147b8f7e9aab66887ed1484e6aaeeb102 Mon Sep 17 00:00:00 2001
From: Vivien Kraus <vivien@planete-kraus.eu>
Date: Thu, 4 Nov 2021 10:59:18 +0100
Subject: [PATCH 1/2] gnu: Add texlive-dvips-l3backend.

* gnu/packages/tex.scm (texlive-dvips-l3backend): New variable.
---
 gnu/packages/tex.scm | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/gnu/packages/tex.scm b/gnu/packages/tex.scm
index bf427f1594..888ded3fce 100644
--- a/gnu/packages/tex.scm
+++ b/gnu/packages/tex.scm
@@ -3513,6 +3513,23 @@ (define-public texlive-latex-l3packages
 @end enumerate\n")
     (license license:lppl1.3c+)))
 
+(define-public texlive-dvips-l3backend
+  (package
+    (inherit (simple-texlive-package
+              "texlive-dvips-l3backend"
+              (list
+               "/dvips/l3backend/")
+              (base32
+               "1hvj153h1pn93h6n76dv3mg9ai0mcz9q9mysfiqjfpqzijz9ikky")
+              #:trivial? #t))
+    (home-page "https://www.ctan.org/pkg/l3backend")
+    (synopsis "LaTeX3 backend drivers for dvips")
+    (description
+     "This package forms parts of expl3, and contains the code used to
+interface with backends (drivers) across the expl3 codebase.  The functions
+here are defined for the dvips engine only.")
+    (license license:lppl1.3c+)))
+
 (define-public texlive-fontspec
   (let ((template (simple-texlive-package
                    "texlive-fontspec"
-- 
2.33.1


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From a7568441319c4e42ec2e51dfddf62eacb0a054e2 Mon Sep 17 00:00:00 2001
From: Vivien Kraus <vivien@planete-kraus.eu>
Date: Thu, 4 Nov 2021 01:02:39 +0100
Subject: [PATCH 2/2] gnu: unison: Fix building the manual.

* gnu/packages/ocaml.scm (unison)[native-inputs]: Add the missing texlive inputs.
---
 gnu/packages/ocaml.scm | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/ocaml.scm b/gnu/packages/ocaml.scm
index 7b1363a5c3..5b190e7e8d 100644
--- a/gnu/packages/ocaml.scm
+++ b/gnu/packages/ocaml.scm
@@ -1205,7 +1205,8 @@ (define-public unison
      `(("ocaml" ,ocaml-4.09)
        ;; For documentation
        ("ghostscript" ,ghostscript)
-       ("texlive" ,texlive-tiny)
+       ("texlive" ,(texlive-updmap.cfg
+                    (list texlive-fonts-ec texlive-dvips-l3backend)))
        ("hevea" ,hevea)
        ("lynx" ,lynx)
        ("which" ,which)))
-- 
2.33.1