Ok - you are compiling to a location that odatagen is not expecting.
the 'build' directory must in in the same directory as the objc_imlementation.xsl file (and all other *.xsl files)
-please note that build has a lowercase 'b'
You should be able to copy the program from
Please note that 'odatagen' on then end of each path is the actual executable.
Once you do that - the program should run and give you some output.