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-rw-r--r--gnu/packages/synergy.scm3
1 files changed, 2 insertions, 1 deletions
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 @@
(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)