From ba66eec741a9fbddd74eb7fc54d2c53888ace5b7 Mon Sep 17 00:00:00 2001
From: Marius Bakke <mbakke@fastmail.com>
Date: Fri, 3 Apr 2020 18:04:38 +0200
Subject: [PATCH] gnu: synergy: Fix build failure.

* gnu/packages/synergy.scm (synergy)[arguments]: Prepend to CPLUS_INCLUDE_PATH
instead of overriding it.
---
 gnu/packages/synergy.scm | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/synergy.scm b/gnu/packages/synergy.scm
index 367bb323b3..739ea3bd75 100644
--- a/gnu/packages/synergy.scm
+++ b/gnu/packages/synergy.scm
@@ -63,7 +63,8 @@ (define-public synergy
            (lambda* (#:key inputs #:allow-other-keys)
              (setenv "CPLUS_INCLUDE_PATH"
                      (string-append (assoc-ref inputs "avahi")
-                                    "/include/avahi-compat-libdns_sd"))
+                                    "/include/avahi-compat-libdns_sd:"
+                                    (or (getenv "CPLUS_INCLUDE_PATH") "")))
              #t)))))
     (inputs
      `(("avahi" ,avahi)