Adriaan de Groot authored Nov 04, 2019 and Fabian Vogt committed Dec 21, 2019

 - needs additional LDFLAGS (basically, -L/usr/local/lib because
   that's not in the standard link path, and all user-installed
   libraries live there). An alternative would be to find_library
   to massage -lfuse3 to an absolute path, but since there's
   potentially multiple libraries in FUSE3_LIBRARIES, it'd take
   a bunch of CMake boilerplate. Go for simplicity.
 - massage includes; <linux/fs.h> isn't there, and then we need
   to define some non-POSIXy flags that come from that header.