flex – Lex with .c and .l file I want to read a tsv

I work in Lex and I have an L-file with regular expressions and a C-file with some functions of C and I want to read a TSV file and print only some parts of that file.
I have to do:

flex file.l
gcc -o lex.yy.c file -lfl

From here I have to integrate the .tsv file into these commands so that .l and .c can identify them. How do I do that?