Error installing hobbit: librrd2-dev conflicts with librrd0

Hi, I get the error when attempting to install hobbit 4.2.0, librrd0 1.0.49, RRDTool 1.2.15 on Ubuntu 7.04 :

$ sudo dpkg -i librrd0_1.0.49-1_i386.deb dpkg: regarding librrd0_1.0.49-1_i386.deb containing librrd0: librrd2-dev conflicts with librrd0 librrd0 (version 1.0.49-1) is to be installed. dpkg: error processing librrd0_1.0.49-1_i386.deb (--install): conflicting packages - not installing librrd0 Errors were encountered while processing: librrd0_1.0.49-1_i386.deb

Is there a list of compatible versions to use when installing Hobbit?

Thanks a bunch! Marjorie