In Linux:

# git clone https://github.com/kdlucas/byte-unixbench.git
# cd byte-unixbench/UnixBench/
# ./Run 

Modifications on FreeBSD:
comment out in Makefile
#OSNAME:=$(shell uname -s)
modify ./Run
#!/usr/bin/perl -w
#!/usr/local/bin/perl -w
my $make = $ENV{MAKE} || "make";
my $make = $ENV{MAKE} || "gmake";
then

./Run