Th SENF debian distribution consists of the following packages:

  libsenf       non-debug static library   /usr/lib/libsenf.a 
                                           /usr/lib/senf-packets/

  libsenf-dbg   debug static library       /usr/lib/libsenf_g.a
                                           /usr/lib/debug/senf-packets/

  libsenf-dev   include files              /usr/include/senf

  libsenf-doc   documentation              /usr/share/doc/libsenf-doc/


So to develop using SENF, you will need 'libsenf-dev' and one of
'libsenf' or 'libsenf-dbg' however, you will probably want to install
both, 'libsenf' and 'libsenf-dbg'.

To compile an application against the debug library, just link against
the libsenf_g.a library.

To compile an application against the non-debug library, link against
libsenf.a AND ENSURE, THE PREPROCESSOR SYMBOL 'SENF_NO_DEBUG' IS
DEFINED in your build, best by adding '-DSENF_NO_DEBUG' to CPPFLAGS.

Lets repeat that:

  VERY IMPORTANT: When building against libsenf.a, you MUST define
  SENF_NO_DEBUG. Don't say, you haven't been warned ...