61/66: gnu: texlive-fonts-knuth-lib: Use invoke.

[Mark H. Weaver]

mhw pushed a commit to branch core-updates
in repository guix.

commit 849527e5316172524aa85db4f55174819aaf6caf
Author: Mark H Weaver <address@hidden>
Date:   Fri Mar 23 04:05:40 2018 -0400

    gnu: texlive-fonts-knuth-lib: Use invoke.
    
    * gnu/packages/tex.scm (texlive-fonts-knuth-lib)[arguments]: Use invoke in 
the
    custom build phase.
---
 gnu/packages/tex.scm | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/gnu/packages/tex.scm b/gnu/packages/tex.scm
index 29792cb..056039b 100644
--- a/gnu/packages/tex.scm
+++ b/gnu/packages/tex.scm
@@ -628,13 +628,13 @@ display, and mathematical fonts in a range of styles, 
based on Monotype Modern
                        (string-append (getcwd) ":"
                                       mf "/share/texmf-dist/metafont/base")))
              (mkdir "build")
-             (zero? (system* "mf" "-progname=mf"
-                             "-output-directory=build"
-                             (string-append "\\"
-                                            "mode:=ljfour; "
-                                            "mag:=1; "
-                                            "batchmode; "
-                                            "input manfnt")))))
+             (invoke "mf" "-progname=mf"
+                     "-output-directory=build"
+                     (string-append "\\"
+                                    "mode:=ljfour; "
+                                    "mag:=1; "
+                                    "batchmode; "
+                                    "input manfnt"))))
          (replace 'install
            (lambda* (#:key outputs #:allow-other-keys)
              (let* ((out (assoc-ref outputs "out"))