Help in inserting code in etherboot

Good day,
I am working on an LTSP project and I wanted to insert a code inside main.cof 
etherboo5.4.1.
My code uses the following header files of GCC:
sys/types.h, sys/sockets.h, netinet/in.h, arpa/inet.h, netdb.h, stdio.h, 
unistd.h
but there are conflicts(i.e. redefinition of functions).
I am hoping someone could help me solve my problem of including those header 
files mention above.
Thank you.