lex & yacc, Second Edition example compile code problem

I try compile all code using "make" command in linux, but it come back with
compile error, please help.

thank you!

/* output
[work]$ make
flex ch1-01.l
mv lex.yy.c ch1-01.c
gcc -g -o ch1-01.pgm ch1-01.c -ly -ll
/usr/bin/ld: cannot find -ly
collect2: ld returned 1 exit status
make: *** [ch1-01.pgm] Error 1
[work]$

*/
--

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