Recently, I've struggled looking for solution on how to handle compilation error for
a package called
fast_tls in an elixir/phoenix application that I am working on.
Luckily I have found a solution written by
John Hamelink with a title OpenSSL and Elixir.
The blog explains why the error persist and how to fix it.
If you encountered an error that says...
==> fast_tls (compile) Compiled src/fast_tls_app.erl Compiled src/p1_sha.erl Compiled src/fast_tls_sup.erl Compiled src/fast_tls.erl Compiling c_src/fast_tls_drv.c c_src/fast_tls_drv.c:21:10: fatal error: 'openssl/err.h' file not found #include <openssl/err.h>^ 1 error generated. ERROR: compile failed while processing /Users/john/Public/fap/api/api-2.1/deps/fast_tls: rebar_abort ==> api \* (Mix) Could not compile dependency :fast_tls, "/Users/john/.asdf/installs/elixir/1.2.3/.mix/rebar compile skip_deps=true deps_dir="/Users/john/Public/fap/api/api-2.1/_build/dev/lib"" command failed. You can recompile this dependency with "mix deps.compile fast_tls", update it with "mix deps.update fast_tls" or clean it with "mix deps.clean fast_tls"
fast_tls is a TLS / SSL OpenSSL-based native driver for Erlang / Elixir that is using OpenSSL. In my case I am using a OpenSSl v1.1.
You can either compile fast_tls via this command
env LDFLAGS="-L$(brew --prefix openssl)/lib" CFLAGS="-I$(brew --prefix openssl)/include" mix compile
OR you can indicate the version
env LDFLAGS="-L$(brew --prefix firstname.lastname@example.org)/lib" CFLAGS="-I$(brew --prefix email@example.com)/include" mix compile