* gnu/packages/video.scm (mkvtoolnix)[arguments]: Add a
‘patch-relative-file-names’ phase to call ‘mkvmerge’ from :out.
"--enable-precompiled-headers=no")
#:phases
(modify-phases %standard-phases
+ (add-after 'unpack 'patch-relative-file-names
+ (lambda* (#:key outputs #:allow-other-keys)
+ (let ((out (assoc-ref outputs "out")))
+ (substitute* "src/mkvtoolnix-gui/util/settings.cpp"
+ (("mkvmerge" match)
+ (string-append out "/bin/" match)))
+ #t)))
(add-before 'configure 'add-googletest
(lambda* (#:key inputs #:allow-other-keys)
(symlink