[libcxx-dev] Problem installing libcxx and libcxxabi using Bootstrapping on Amazon Linux 2

[Raul Tambre via libcxx-dev]

 > Appending -L is giving same error:

Is libc++.so.1.0 actually in the folder /usr/local/lib/x86_64-unknown-linux?
Where is ld searching (-v)?

 > Below is also giving above error i.e. "make: /usr/bin/opt: Command not found"

I guess plv8 also requires opt, so also build that. Since you are installing 
/usr/local you may need to override LLVM_BINPATH that plv8 uses. It's unclear to 
me how it's set or derived by default.