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-rw-r--r--gnu/packages/ruby.scm9
-rw-r--r--gnu/packages/tex.scm2
2 files changed, 10 insertions, 1 deletions
diff --git a/gnu/packages/ruby.scm b/gnu/packages/ruby.scm
index 0fa68be980..591bd8034b 100644
--- a/gnu/packages/ruby.scm
+++ b/gnu/packages/ruby.scm
@@ -3597,6 +3597,15 @@ two hashes.")
 It is a low-dependency variant of ruby-hydra.")
       (license license:expat))))
 
+;; Pinned variant for use by texlive
+(define-public ruby-hydra-minimal/pinned
+  (hidden-package
+   (package
+     (inherit ruby-hydra-minimal)
+     (arguments
+      (cons* #:ruby ruby-2.7
+             (package-arguments ruby-hydra-minimal))))))
+
 (define-public ruby-hydra
   (package
     (inherit ruby-hydra-minimal)
diff --git a/gnu/packages/tex.scm b/gnu/packages/tex.scm
index 6c055ed0cd..65f8d901d7 100644
--- a/gnu/packages/tex.scm
+++ b/gnu/packages/tex.scm
@@ -236,7 +236,7 @@ files from LOCATIONS with expected checksum HASH.  CODE is not currently in use.
                         (string-append "File.join(\"" ptex "\"")))
                      (invoke "ruby" "generate-ptex-patterns.rb")))))))))
       (native-inputs
-       (list ruby-2.7 ruby-hydra-minimal hyph-utf8-scripts))
+       (list ruby-2.7 ruby-hydra-minimal/pinned hyph-utf8-scripts))
       (home-page "https://ctan.org/pkg/hyph-utf8"))))
 
 (define texlive-extra-src