qt4: fixed build by helping the linker to find the libraries

qt/qt4/qt4.conf

@@ -23,6 +23,12 @@ if [ "$prefix" = "usr" ]; then
 fi
 
 pkg_qt4_preconf() {
+	# helping the linker to find libraries
+	QTDIR=$PWD
+	var_insert LD_LIBRARY_PATH ':' "$QTDIR/lib"
+	var_insert PATH ':' "$QTDIR/bin"
+	export QTDIR LD_LIBRARY_PATH PATH
+
 	# Somehow config options get removed if using the standard config
 	# handling. So we use a custom one here.
 	./configure $confopt