Hello,
There are two possible problems: the systemC is not properly intalled or the ArchC could not find it.
First off all, check if the SystemC is installed.
One way to do this is verify if the lib-systemc was created in your systemc installation path.
If is not, go back and install systemC again doing
cd <systemc_path>
./configure --prefix=<systemc_path>
make
make install
After this, you need to use the systemc path in the ./configure command of the ArchC installing process.
Ex: cd <archc_path>
./configure --prefix=<archc_path> --with-systemc=<systemc_path>
make
make install
Liana.