qextserialport: allow building with Qt5

qextserialport builds fine with both Qt4 and Qt5, so this commit
enables it for Qt5.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/qextserialport/Config.in

@@ -1,8 +1,6 @@
 config BR2_PACKAGE_QEXTSERIALPORT
 	bool "qextserialport"
-	# Qt is a big library, we don't want to select it
-	# automatically without the user knowing
-	depends on BR2_PACKAGE_QT
+	depends on BR2_PACKAGE_QT || BR2_PACKAGE_QT5
 	help
 	  A Qt library to manage serial ports
 

package/qextserialport/qextserialport.mk

@@ -10,13 +10,19 @@ QEXTSERIALPORT_SITE_METHOD = git
 
 QEXTSERIALPORT_LICENSE = MIT
 
-QEXTSERIALPORT_DEPENDENCIES = qt
-
 QEXTSERIALPORT_INSTALL_STAGING = YES
 
+ifeq ($(BR2_PACKAGE_QT),y)
+QEXTSERIALPORT_DEPENDENCIES += qt
 define QEXTSERIALPORT_CONFIGURE_CMDS
 	(cd $(@D); $(TARGET_MAKE_ENV) $(QT_QMAKE))
 endef
+else ifeq ($(BR2_PACKAGE_QT5),y)
+QEXTSERIALPORT_DEPENDENCIES += qt5base
+define QEXTSERIALPORT_CONFIGURE_CMDS
+	(cd $(@D); $(TARGET_MAKE_ENV) $(QT5_QMAKE))
+endef
+endif
 
 define QEXTSERIALPORT_BUILD_CMDS
 	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D)