Use Python in C

I need to use features that are only available in Python for a program written in C. I found several sources to help me but just one of them gives me the command to compile the code:

gcc -I/usr/include/python2.7 prog.c -lpython2.7 -o prog -Wall  && ./prog 

I had to change it to

gcc -I/usr/include/python3.4 prog.c -lpython3.4 -o prog -Wall  && ./prog

but the compiler returns:

/usr/bin/ld: cannot find -lpython3.4 collect2: error: ld returned 1 exit status 

It's one of the first times I have used gcc so I really don't understand what to do even when I look at examples.