OTHER: Redo pkg-config handling once again.

src/src.pro

@@ -1,8 +1,11 @@
 TEMPLATE = app
 
 include (../config.pri)
+PKGCONFIG += xmms2-client-cpp
 load (../features/pkgconfig.prf)
 
+!xmms2-client-cpp:error (Please install the xmms2 c++ client library)
+
 COMPONENTS+=../lib/liblib.a
 LIBS += $$COMPONENTS
 PRE_TARGETDEPS = $$COMPONENTS
@@ -29,13 +32,5 @@ QMAKE_CXXFLAGS += -g
 ;CONFIG += debug warn_on
 QMAKE_CXXFLAGS_WARN_ON += -Wno-unused-parameter
 
-XMMSCLIENTPKG += xmms2-client-cpp
-pkgconfig_exists ($$XMMSCLIENTPKG) {
-	QMAKE_CXXFLAGS  += $$pkgconfig_cflags($$XMMSCLIENTPKG)
-	LIBS += $$pkgconfig_libs($$XMMSCLIENTPKG)
-} else {
-	error (Please install the xmms2 c++ client library)
-}
-
 ;CONFIG += avahi