errors when installing densepose

[EmanueleFeola]

when I run make ops, I get this bunch of errors. Does anyone have an idea why?

CMakeFiles/caffe2_detectron_custom_ops.dir/build.make:62: recipe for target 'CMakeFiles/caffe2_detectron_custom_ops.dir/detectron/ops/zero_even_op.cc.o' failed
make[3]: *** [CMakeFiles/caffe2_detectron_custom_ops.dir/detectron/ops/zero_even_op.cc.o] Error 1
make[3]: *** Waiting for unfinished jobs....
CMakeFiles/caffe2_detectron_custom_ops.dir/build.make:86: recipe for target 'CMakeFiles/caffe2_detectron_custom_ops.dir/detectron/ops/pool_points_interp.cc.o' failed
make[3]: *** [CMakeFiles/caffe2_detectron_custom_ops.dir/detectron/ops/pool_points_interp.cc.o] Error 1
make[3]: Leaving directory '/home/greensoft/densepose/build'
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/caffe2_detectron_custom_ops.dir/all' failed
make[2]: *** [CMakeFiles/caffe2_detectron_custom_ops.dir/all] Error 2
make[2]: Leaving directory '/home/greensoft/densepose/build'
Makefile:127: recipe for target 'all' failed
make[1]: *** [all] Error 2
make[1]: Leaving directory '/home/greensoft/densepose/build'
Makefile:13: recipe for target 'ops' failed
make: *** [ops] Error 2