Check rootkits

Hi people,

I have a SUN station with Solaris 7 I don't know if it was compromised with
a hacking.

I want to use the chkrootkit package (www.chkrootkit.org) in order to check
rootkits and trojans, but when a want to create the executable file with the
"make sense" command as explained in the home page, I get an error telling
something about GCC. I don't have the gcc program in my OS:

# /usr/ccs/bin/make -d sense
MAKEFLAGS value:
Building chklastlog because it is out of date relative to chklastlog.c
gcc -DHAVE_LASTLOG_H -o chklastlog chklastlog.c
sh: gcc: not found
*** Error code 1
make: Fatal error: Command failed for target `chklastlog'

Do you know if make use gcc ???

Or di you know any other program to check rootkits and trjans ???

Thanks a lot

Alejandro