Rework osg config options

Makefile

@@ -82,10 +82,6 @@ One of the project’s primary goals is to provide an open and collaborative env
 endef
 
 
-# Set up default build configurations (debug | release)
-GCS_BUILD_CONF		:= release
-GOOGLE_API_VERSION	:= 14
-
 # Clean out undesirable variables from the environment and command-line
 # to remove the chance that they will cause problems with our build
 define SANITIZE_VAR
@@ -149,6 +145,14 @@ endif
 
 export UAVOBJGENERATOR
 
+# Set up default build configurations (debug | release)
+GCS_BUILD_CONF := release
+GCS_EXTRA_CONF := osg copy_osg
+
+ifeq ($(UNAME), Windows)
+    GCS_EXTRA_CONF += osgearth
+endif
+
 ##############################
 #
 # All targets

ground/gcs/src/libs/libs.pro

@@ -12,6 +12,6 @@ SUBDIRS = \
     qwt \
     sdlgamepad
 
-exists( $(OSG_SDK_DIR) ) {
+osg {
     SUBDIRS += osgearth
 }

ground/gcs/src/libs/osgearth/copydata.pro

@@ -11,6 +11,10 @@ contains(QT_ARCH, x86_64)  {
     LIB_DIR_NAME = lib
 }
 
+!msys2:OSG_VERSION = 3.4.0
+msys2:OSG_VERSION = 3.5.1
+
+
 osg:linux {
     # copy osg libraries
     data_copy.commands += $(MKDIR) $$GCS_LIBRARY_PATH/osg $$addNewline()

ground/gcs/src/libs/osgearth/osgearth.pri

@@ -1,7 +1,8 @@
-exists( $(OSG_SDK_DIR) ) {
+osg {
 	DEFINES += USE_OSG
 	LIBS *= -l$$qtLibraryName(GCSOsgEarth)
 }
-exists( $(OSGEARTH_SDK_DIR) ) {
+
+osgearth {
 	DEFINES += USE_OSGEARTH
 }

ground/gcs/src/libs/osgearth/osgearth.pro

@@ -4,17 +4,6 @@ DEFINES += OSGEARTH_LIBRARY
 
 #CONFIG += mys2
 
-CONFIG += osg
-#CONFIG += osgQt
-
-exists( $(OSGEARTH_SDK_DIR) ) {
-    CONFIG += osgearth
-    #CONFIG += osgearthQt
-}
-
-!msys2:OSG_VERSION = 3.4.0
-msys2:OSG_VERSION = 3.5.1
-
 osg:DEFINES += USE_OSG
 osgQt:DEFINES += USE_OSG_QT
 
@@ -86,4 +75,4 @@ osgearth:SOURCES += \
     osgQtQuick/OSGModelNode.cpp \
     osgQtQuick/OSGSkyNode.cpp
 
-include(copydata.pro)
+copy_osg:include(copydata.pro)