karlsson@karlsson-laptop:~/poly$ make
gcc -g -pedantic -std=c99 -Wall -Werror   -c -o poly.o poly.c
poly.c:14: error: redefinition of typedef ‘poly_t’
poly.h:4: error: previous declaration of ‘poly_t’ was here
cc1: warnings being treated as errors
poly.c:70: warning: return type of ‘main’ is not ‘int’
make: *** [poly.o] Error 1
[2]-  Done                    gedit poly.h