Don't replace an existing service file

diff --git a/Makefile.am b/Makefile.am
index f576001d20915ba4b23da85c9eaa47c51b6d5886..f9fd8976bff2a1a15720b320a86daff5eb7c196f 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -62,5 +62,5 @@ if INSTALL_SYSTEMV
 endif
 if INSTALL_SYSTEMD
        [ -e $(DESTDIR)$(systemdsystemunitdir) ] || mkdir -p $(DESTDIR)$(systemdsystemunitdir)
-       cp scripts/shairport-sync.service $(DESTDIR)$(systemdsystemunitdir)
+       [ -f $(DESTDIR)$(systemdsystemunitdir)/shairport-sync.service ] || cp scripts/shairport-sync.service $(DESTDIR)$(systemdsystemunitdir)
 endif