refs #461 Use the REQUIRES variable in the leaf projects instead of conditions at the SUBDIRS level.

src/src.pro

@@ -4,38 +4,15 @@ TEMPLATE = subdirs
 CONFIG += ordered
 
 SUBDIRS += blackmisc
-
-contains(BLACK_CONFIG, BlackSound) {
-    SUBDIRS += blacksound
-}
-
-contains(BLACK_CONFIG, BlackInput) {
-    SUBDIRS += blackinput
-}
-
-contains(BLACK_CONFIG, BlackCore) {
-    SUBDIRS += blackcore
-    contains(BLACK_CONFIG, BlackGui) {
-        SUBDIRS += blackgui
-        contains(BLACK_CONFIG, SwiftGui) {
-            SUBDIRS += swiftguistandard
-        }
-        contains(BLACK_CONFIG, SwiftCore) {
-            SUBDIRS += swiftcore
-        }
-        contains(BLACK_CONFIG, SwiftData) {
-            SUBDIRS += swiftdata
-        }
-        contains(BLACK_CONFIG, SwiftLauncher) {
-            SUBDIRS += swiftlauncher
-        }
-    }
-}
-
-contains(BLACK_CONFIG, XPlane) {
-    SUBDIRS += xbus/xbus.pro
-}
-
+SUBDIRS += blacksound
+SUBDIRS += blackinput
+SUBDIRS += blackcore
+SUBDIRS += blackgui
+SUBDIRS += swiftguistandard
+SUBDIRS += swiftcore
+SUBDIRS += swiftdata
+SUBDIRS += swiftlauncher
+SUBDIRS += xbus
 SUBDIRS += plugins
 
 load(common_post)