Build FINAL CUT with the clang c++ compiler
-------------------------------------------
openbsd# CXX=clang++ ./build.sh

Build FINAL CUT with eg++
-------------------------
openbsd# CXX=eg++ ./build.sh

Install egcc on OpenBSD
-----------------------
openbsd# pkg_add g++
quirks-3.124 signed on 2019-04-15T12:10:16Z
Ambiguous: choose package for g++
a	0: <None>
	1: g++-4.9.4p18
	2: g++-8.3.0
Your choice: 2
g++-8.3.0:gcc-libs-8.3.0: ok
g++-8.3.0:gmp-6.1.2p3: ok
g++-8.3.0:mpfr-3.1.5.2p0: ok
g++-8.3.0:libmpc-0.9p2: ok
g++-8.3.0:gcc-8.3.0: ok
g++-8.3.0: ok