pkg/53963: claws-mail: Fix compilation on Darwin

[js-pkgsrc%heap.zone@localhost]

>Number:         53963
>Category:       pkg
>Synopsis:       claws-mail: Fix compilation on Darwin
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Feb 09 10:45:00 +0000 2019
>Originator:     Jonathan Schleifer
>Release:        HEAD
>Organization:
>Environment:
Darwin
>Description:
claws-mail depends on startup-notification, even when using native Quartz GTK.
>How-To-Repeat:
Build claws-mail on Darwin
>Fix:
commit 60b847b20513f5f1bd386156aa35ead4e598b7eb
Author: Jonathan Schleifer <js%heap.zone@localhost>
Date:   Sun Aug 13 20:40:53 2017 +0200

    claws-mail: Fix compilation on Darwin

diff --git a/mail/claws-mail/Makefile b/mail/claws-mail/Makefile
index 22491665473..99d195af365 100644
--- a/mail/claws-mail/Makefile
+++ b/mail/claws-mail/Makefile
@@ -78,7 +78,9 @@ PLIST_SRC+=	PLIST.shred
 .include "../../converters/libiconv/buildlink3.mk"
 .include "../../graphics/hicolor-icon-theme/buildlink3.mk"
 .include "../../x11/gtk2/buildlink3.mk"
+.if "${OPSYS}" != "Darwin"
 .include "../../x11/startup-notification/buildlink3.mk"
+.endif
 .include "../../x11/libSM/buildlink3.mk"
 .include "../../sysutils/desktop-file-utils/desktopdb.mk"
 .include "../../mk/bdb.buildlink3.mk"