package/gdal: add expat optional dependency

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/gdal/gdal.mk

@@ -51,7 +51,6 @@ GDAL_CONF_OPTS = \
 	-DGDAL_USE_CRNLIB=OFF \
 	-DGDAL_USE_CURL=OFF \
 	-DGDAL_USE_ECW=OFF \
-	-DGDAL_USE_EXPAT=OFF \
 	-DGDAL_USE_FILEGDB=OFF \
 	-DGDAL_USE_FREEXL=OFF \
 	-DGDAL_USE_GEOS=OFF \
@@ -107,6 +106,13 @@ GDAL_CONF_OPTS = \
 	-DBUILD_JAVA_BINDINGS=OFF \
 	-DBUILD_PYTHON_BINDINGS=OFF
 
+ifeq ($(BR2_PACKAGE_EXPAT),y)
+GDAL_DEPENDENCIES += expat
+GDAL_CONF_OPTS += -DGDAL_USE_EXPAT=ON
+else
+GDAL_CONF_OPTS += -DGDAL_USE_EXPAT=OFF
+endif
+
 ifeq ($(BR2_PACKAGE_LIBXML2),y)
 GDAL_DEPENDENCIES += libxml2
 GDAL_CONF_OPTS += -DGDAL_USE_LIBXML2=ON