Thanks Sebastien! Now the problem is when I try to run the binary, when I put on command line: ./nfqnl_test the following error happend: ./nfqnl_test: error while loading shared libraries: libnfnetlink.so.0: cannot open shared object file: No such file or directory Nevertheless my box have theses files: /usr/local/lib/libnfnetlink.so.0 /usr/local/lib/libnfnetlink.so.0.0.0 Beside, when I install the libnfnetlink ("./configure;make;make install") I get a binary of nfqnl_test.c into utils directory and when I run it all is fine. Salute Frank Abel On Monday 22 May 2006 10:06 am, you wrote: > Frank Abel Cancio Bello wrote: > > Hi all! > > > > A newbie question: > > When I try to compile "nfqnl_test.c" putting on command line: > > > > "gcc -Wall -o nfqnl_test nfqnl_test.c" > > > > the following error occur: > > [snip errors] > > you forgot to include required library symbols: > > gcc -Wall -o nfqnl_test nfqnl_test.c -lnfnetlink -lnetfilter_queue > > will do __________________________________________ XIII Convención Científica de Ingeniería y Arquitectura 28/noviembre al 1/diciembre de 2006 Cujae, Ciudad de la Habana, Cuba http://www.cujae.edu.cu/eventos/convencion