${HOME}/data/project/rpm. Then, edit
     ~/.rpmmacros file like : 
     
  # cat ~/.rpmmacros
  %_topdir ${HOME}/data/project/rpm
     
 
  # mkdir -p BUILD RPMS/i386 SOURCES SPECS SRPMS ROOT 
     
SPECS/tmk-0.90_1.spec
 rpm -ba tmk-090.1_noarch.spec