Checking if your kit is complete...
Looks good
Note (probably harmless): No library found for -ldnet
Writing Makefile for Net::Libdnet
cp Libdnet.pm blib/lib/Net/Libdnet.pm
AutoSplitting blib/lib/Net/Libdnet.pm (blib/lib/auto/Net/Libdnet)
/home/cpanrun/build/5.6.1/bin/perl -I/home/cpanrun/build/5.6.1/lib/5.6.1/i686-linux-thread-multi -I/home/cpanrun/build/5.6.1/lib/5.6.1 /home/cpanrun/build/5.6.1/lib/5.6.1/ExtUtils/xsubpp  -typemap /home/cpanrun/build/5.6.1/lib/5.6.1/ExtUtils/typemap Libdnet.xs > Libdnet.xsc && mv Libdnet.xsc Libdnet.c
gcc -c -I/usr/local/include -DUSE_REENTRANT_API -D_GNU_SOURCE -D_REENTRANT -fno-strict-aliasing -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O2   -DVERSION=\"0.01\" -DXS_VERSION=\"0.01\" -fpic -I/home/cpanrun/build/5.6.1/lib/5.6.1/i686-linux-thread-multi/CORE  Libdnet.c
Libdnet.xs:35: dnet.h: No such file or directory
make: *** [Libdnet.o] Error 1