Build Fails

[keith-dev]

[ 28%] Building CXX object tests/CMakeFiles/test_blk3_BLOCKING.dir/test_blk3.cpp.o
fastflow/tests/test_blk3.cpp: In member function ‘virtual fftask_t* First::svc(fftask_t*)’:
/home/kbw/Code/git/fastflow/tests/test_blk3.cpp:75:36: error: ‘BLK’ was not declared in this scope
   75 |                 while(!ff_send_out(BLK));
      |                                    ^~~
fastflow/tests/test_blk3.cpp:78:36: error: ‘NBLK’ was not declared in this scope
   78 |                 while(!ff_send_out(NBLK));
      |                                    ^~~~
fastflow/tests/test_blk3.cpp:81:36: error: ‘BLK’ was not declared in this scope
   81 |                 while(!ff_send_out(BLK));
      |                                    ^~~
make[2]: *** [tests/CMakeFiles/test_blk3_BLOCKING.dir/build.make:63: tests/CMakeFiles/test_blk3_BLOCKING.dir/test_blk3.cpp.o] Error 1

BLK and NBLK are undefined.