ERROR: Missing binary: libffi/3.2.1:6d87124bcf4cc4435e13c44634d61b77404bef31
libffi/3.2.1: WARN: Can't find a 'libffi/3.2.1' package for the specified settings, options and dependencies:
- Settings: arch=x86_64, build_type=Release, compiler=clang, compiler.version=8, os=Linux
- Options: fPIC=True, shared=False
- Dependencies: 
- Requirements: 
- Package ID: 6d87124bcf4cc4435e13c44634d61b77404bef31

ERROR: Missing prebuilt package for 'libffi/3.2.1'
Try to build from sources with "--build=libffi"
Or read "http://docs.conan.io/en/latest/faq/troubleshooting.html#error-missing-prebuilt-package"