From 31ec52283517690b6fce91bcdd328bb14f579eff Mon Sep 17 00:00:00 2001
From: Efraim Flashner <efraim@flashner.co.il>
Date: Wed, 27 Sep 2017 10:08:42 +0300
Subject: [PATCH] gnu: lilypond: Fix fontforge detection.

* gnu/packages/music.scm (lilypond)[arguments]: Adjust fontforge
detection algorithm to allow for SOURCE_DATE_EPOCH in fontforge's build.
---
 gnu/packages/music.scm | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/music.scm b/gnu/packages/music.scm
index cd354b00d7..abfe3be5f5 100644
--- a/gnu/packages/music.scm
+++ b/gnu/packages/music.scm
@@ -677,7 +677,9 @@ Sega Master System/Mark III, Sega Genesis/Mega Drive, BBC Micro
               (("SHELL=/bin/sh") "SHELL=sh")
               ;; When checking the fontforge version do not consider the
               ;; version string that's part of the directory.
-              (("head -n") "tail -n"))
+              (("head -n") "tail -n")
+              ;; Also allow for SOURCE_DATE_EPOCH = 0 in fontforge.
+              (("20110222") "19700101"))
             (setenv "out" "www")
             (setenv "conf" "www")
             #t))