I came across a couple of improvements when looking at packaging
emacs-org-plus-contrib.

Christopher Baines (2):
  emacs-build-system: Handle missing programs when patching.
  emacs-build-system: Change how patch-el-files substitutes commands.

 guix/build/emacs-build-system.scm | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)