Fortran compilstion result

hello all,
I got the following Fortran compilation result:

Pavel@MacBook-Pro-2 Vibe_OPS_30.01.17 %
Pavel@MacBook-Pro-2 Vibe_OPS_30.01.17 % gfortran -o vbs vbs.f
Undefined symbols for architecture x86_64:
"_abc_", referenced from:
_mazing_ in ccrzsvTo.o
"_close_", referenced from:
_MAIN__ in ccrzsvTo.o
"_g_", referenced from:
_ampl_ in ccrzsvTo.o
"_pkr_", referenced from:
_pirson_ in ccrzsvTo.o
"_v9_", referenced from:
_MAIN__ in ccrzsvTo.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status
Pavel@MacBook-Pro-2 Vibe_OPS_30.01.17 %
Pavel@MacBook-Pro-2 Vibe_OPS_30.01.17 %

How I can fix it?
Thank you