inn-devel-2.2-8 does not install INN's include files.
inn-devel-1.7 in RH 5.2 installed dbz.h, inndcomm.h, and
libinn.h. No .h files are installed by 2.2 RPM. Include
files are required for INN-related software to compile.
For INN 2.2, the "suck" client requires the following files
to be installed from inn-2.2/include:
At least these four files are required. Other clients may
require additional files.
The subject .h files are not in either the inn or inn-devel packages.
Fixed (by adding these files to /usr/include/inn) in inn-2.2-12.
Thanks for the report.