gnu: Add texlive-cm-lgc.

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

gnu/packages/tex.scm

@@ -1028,6 +1028,31 @@ (define-public texlive-cm
 
 (define-deprecated-package texlive-fonts-cm texlive-cm)
 
+(define-public texlive-cm-lgc
+  (package
+    (inherit (simple-texlive-package
+              "texlive-cm-lgc"
+              (list "/doc/fonts/cm-lgc/"
+                    "/fonts/afm/public/cm-lgc/"
+                    "/fonts/type1/public/cm-lgc/"
+                    "/fonts/vf/public/cm-lgc/"
+                    "/tex/latex/cm-lgc/")
+              (base32
+               "0rm7wgyb07y8h6vbvc2xzsqnxy322d4j9ly2p67z84b81c8i3zpc")
+              #:trivial? #t))
+    (home-page "https://www.ctan.org/pkg/cm-lgc")
+    (synopsis "Type 1 CM-based fonts for Latin, Greek and Cyrillic")
+    (description "The fonts are converted from Metafont sources of the
+Computer Modern font families, using @command{textrace}.  Supported encodings
+are: T1 (Latin), T2A (Cyrillic), LGR (Greek) and TS1.  The package also
+includes Unicode virtual fonts for use with Omega.  The font set is not a
+replacement for any of the other Computer Modern-based font sets (for example,
+cm-super for Latin and Cyrillic, or cbgreek for Greek), since it is available
+at a single size only; it offers a compact set for @i{general} working.  The
+fonts themselves are encoded to external standards, and virtual fonts are
+provided for use with TeX.")
+    (license license:gpl2+)))
+
 (define-public texlive-cm-super
   (let ((template (simple-texlive-package
                    "texlive-cm-super"