OT: sqrt() not recognized in c program??

[<kaynjay@igalaxy.net>]

Does someone know why I would get the following errors in a compilation of a
C app?  I would think that the sqrt function is in one of the libraries
defined in the beginning of the code (e.g. #include <math.h> ).

kaynjay:/home/autodock/dist_3.0/src/autotors# cc -o autotors autotors.c
/tmp/ccc01215: In function 'check_aromatic':
/tmp/ccc01215(.text+0x1b4f): undefined reference to 'sqrt'
/tmp/ccc01215: In function 'main':
/tmp/ccc01215(.text+0xa586): undefined reference to 'sqrt'
/tmp/ccc01215(.text+0xba83): undefined reference to 'sqrt'

The compile dies with these.

There are no directions for compiling.  I'm following the same pattern given
for another program in the distribution.

Thanks for any help!

Kenward Vaughan