[bug#50081] [PATCH core-updates-frozen v2] gnu: texlive-texmf: Disable LuaJIT engines on powerpc64*

[Thiago Jung Bauermann]

LuaJIT isn’t ported to 64-bit PowerPC. ‘texlive-latex-base’ already
disables the engines that rely on it, so just do the same in texlive-texmf.

Fix suggested by Mathieu Othacehe <othacehe@gnu.org>.

* gnu/packages/tex.scm (texlive-texmf)[arguments]<#:phases>{texmf-config}:
Disable LuaJIT engines when building for powerpc64le.
---

Hello,

This fixes the build of ‘texlive-texmf’ on powerpc64le. It was failing
with these errors:

  fmtutil [ERROR]: not building luajittex due to missing engine: luajittex
  fmtutil [ERROR]: not building luajithbtex due to missing engine: luajithbtex

Thank you very much to Mathieu for his help in making  this work.

Changes since v1:
- Match target with “powerpc64” prefix rather than “powerpc64le”.

 gnu/packages/tex.scm | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/gnu/packages/tex.scm b/gnu/packages/tex.scm
index 70166941d554..900438ecacd9 100644
--- a/gnu/packages/tex.scm
+++ b/gnu/packages/tex.scm
@@ -6821,9 +6821,17 @@ directly generate PDF documents instead of DVI.")
                      (share (string-append out "/share"))
                      (texmfroot (string-append share "/texmf-dist/web2c"))
                      (texmfcnf (string-append texmfroot "/texmf.cnf"))
+                     (fmtutilcnf (string-append texmfroot "/fmtutil.cnf"))
                      (texlive-bin (assoc-ref inputs "texlive-bin"))
                      (texbin (string-append texlive-bin "/bin"))
                      (tlpkg (string-append texlive-bin "/share/tlpkg")))
+                ;; LuaJIT is not ported to powerpc64* yet.
+                (if (string-prefix? "powerpc64"
+                                    ,(or (%current-target-system)
+                                        (%current-system)))
+                    (substitute* fmtutilcnf
+                      (("^(luajittex|luajithbtex|mfluajit)" m)
+                       (string-append "#! " m))))
                 ;; Register SHARE as TEXMFROOT in texmf.cnf.
                 (substitute* texmfcnf
                   (("TEXMFROOT = \\$SELFAUTOPARENT")