The error message is that
$ make px4fmu-v2_default
[ 0%] Built target git_nuttx_apps
[ 0%] Built target git_nuttx
src/modules/mavlink/CMakeFiles/git_mavlink_v2.dir/build.make:56: *** target pattern contains no `%'. Stop.
make[2]: *** [src/modules/mavlink/CMakeFiles/git_mavlink_v2.dir/all] Error 2
make[2]: *** Waiting for unfinished jobs…
[ 0%] Built target git_ecl
[ 1%] Built target ver_gen
[ 2%] Built target uorb_headers
make[1]: *** [all] Error 2
make: *** [px4fmu-v2_default] Error 2
It looks like some error for cmake?