NFD » ndn-cxx

Here is the error:

Checking for OpenSSL lib                             : OpenSSL not found, please provide a --with-openssl=PATH argument (see help)

And the cause is some "smartness" of homebrew, which decided to ignore "force linking":

+brew link --force openssl
Warning: Refusing to link: openssl
Linking keg-only openssl means you may end up linking against the insecure,
deprecated system OpenSSL while using the headers from Homebrew's openssl.
Instead, pass the full include/library paths to your compiler e.g.:
  -I/usr/local/opt/openssl/include -L/usr/local/opt/openssl/lib

I'm unsure why this error does not appear on our OSX slaves and only on Travis.