[Discuss-gnuradio] question on howto write a new block

[intermilan]

hi all:
     I am writing a new simple signal processing block following the tutorial under the directory /gnuradio-3.2.2/gr-howto-write-a-block-3.2.2(there is no gr-howto-write-a-block-3.2.2 at the beginning,and this one is I downloaded and copied to this directory)and named 'howto_add_ff' block. I've created howto_add_ff.h and howto_add_ff.cc file under /gnuradio-3.2.2/gr-howto-write-a-block-3.2.2/src/lib.Then I modified howto.i and Makefile.am in the same directory.
   After that  I run the following command under the directory /gnuradio-3.2.2/gr-howto-write-a-block-3.2.2:
   ./bootstrap
   ./configure 
   make
  Then I got a error  said "thers is no rules for "all-am" to creat the required target "howto_add_ff.h".STOP."( I translate the error into english beacause I do no use engliah as the language of my Ununtu).
   Can anyone tell me how to fix it?
                                                                                                                                                            
  Thank you in advance