Use pkg-config to find Qt 4 and 5 instead of direct qmake

# Qt needs some extra effort...

$(obj)/.tmp_qtcheck:

	@set -e; $(kecho) "  CHECK   qt"; \

	qtver=`qmake -query QT_VERSION` || { \

	    echo >&2 "*"; \

	    echo >&2 "* qmake failed."; \

	    echo >&2 "*"; \

	    exit 1; \

	}; \

	qtlibdir=`qmake -query QT_INSTALL_LIBS`; \

	qthdrdir=`qmake -query QT_INSTALL_HEADERS`; \

	qtbindir=`qmake -query QT_INSTALL_BINS`; \

	cflags="-I$$qthdrdir -I$$qthdrdir/QtCore -I$$qthdrdir/QtGui"; \

	case "$$qtver" in \

	5.*) \

	    cflags="$$cflags -I$$qthdrdir/QtWidgets -std=c++11 -fPIC"; \

	    libs="-L$$qtlibdir -lQt5Widgets -lQt5Gui -lQt5Core "; \

	    ;; \

	4.*) \

	    libs="-L$$qtlibdir -lQtGui -lQtCore"; \

	    ;; \

	*) \

	if pkg-config --exists Qt5Core; then \

	    cflags="-std=c++11 -fPIC `pkg-config --cflags Qt5Core Qt5Gui Qt5Widgets`"; \

	    libs=`pkg-config --libs Qt5Core Qt5Gui Qt5Widgets`; \

	    moc=`pkg-config --variable=host_bins Qt5Core`/moc; \

	elif pkg-config --exists QtCore; then \

	    cflags=`pkg-config --cflags QtCore QtGui`; \

	    libs=`pkg-config --libs QtCore QtGui`; \

	    moc=`pkg-config --variable=moc_location QtCore`; \

	else \

	    echo >&2 "*"; \

	    echo >&2 "* Found qmake but it is for Qt version $$qtver, which is not supported."; \

	    echo >&2 "* Please install either Qt 4.8 or 5.x."; \

	    echo >&2 "* Could not find Qt via pkg-config."; \

	    echo >&2 "* Please install either Qt 4.8 or 5.x. and make sure it's in PKG_CONFIG_PATH"; \

	    echo >&2 "*"; \

	    exit 1; \

	    ;; \

	esac; \

	fi; \

	echo "KC_QT_CFLAGS=$$cflags" > $@; \

	echo "KC_QT_LIBS=$$libs" >> $@; \

	echo "KC_QT_MOC=$$qtbindir/moc" >> $@

	echo "KC_QT_MOC=$$moc" >> $@

endif

$(obj)/gconf.o: $(obj)/.tmp_gtkcheck