Trying to compile sophie, configure issue with ld

[Derrick MacPherson]

I am pretty sure this is something wrong on my system's part, but I am not
100% sure what to do about it..

When I try and run configure, it fails, here's what it says in the
config.log


configure:3866: result: /usr/local/lib
configure:3875: checking for SAVIsweepFile in -lsavi
configure:3906: gcc -o conftest -g -O2 -Wall   -Wl,--strip-all
-Wl,-rpath,/usr/local/lib -L/usr/local/lib -lrt conftest.c -lsavi   >
&5
/usr/libexec/elf/ld: cannot find -lrt
configure:3909: $? = 1


Anyone help with that ld error?