ROS Melodic OpenCV xfeatures2d
On ROS Melodic ros-melodic-opencv3 doesn't exist anymore as e.g. on ROS Kinetic. Instead it is recommended to install libopencv-dev http://wiki.ros.org/melodic/Migration... , however, this package does not contain xfeatures2d, neither does libopencv-contrib-dev.
How am I supposed do install xfeatures2d (SURF, SIFT, etc.)? Do I have to build OpenCV 3 now from source?