title: fatal error: openssl/ssl.h: No such file or directory
body: <p>I'm coming from Python and new to C++ and am trying to test a program which retrieves data via websockets.</p>
  
  <p>I copied <a href="https://github.com/binance-exchange/binacpp" rel="nofollow noreferrer">this github repository</a> with </p>
  
  <pre><code>  git clone https://github.com/tensaix2j/binacpp
  </code></pre>
  
  <p>I'm trying to run the example so I filled in the api key and secret in: </p>
  
  <pre><code> /binacpp/example/example.cpp
  </code></pre>
  
  <p>Now from /binacpp/example folder I'm trying </p>
  
  <pre><code>make example
  </code></pre>
  
  <p>and I'm getting this error:</p>
  
  <pre><code>Making example
  
  
  g++ -I../lib/libcurl-7.56.0/include -I../lib/jsoncpp-1.8.3/include -I../lib/libwebsockets-2.4.0/include -I../lib/libbinacpp/include \
  example.cpp \
  -L../lib/libcurl-7.56.0/lib \
  -L../lib/libwebsockets-2.4.0/lib \
  -L../lib/libbinacpp/lib \
  -lcurl -ljsoncpp  -lcrypto -lwebsockets -lbinacpp -o example
  In file included from ../lib/libbinacpp/include/binacpp_websocket.h:16:0,
                   from example.cpp:8:
  ../lib/libwebsockets-2.4.0/include/libwebsockets.h:214:10: fatal error: openssl/ssl.h: No such file or directory
   #include &lt;openssl/ssl.h&gt;
            ^~~~~~~~~~~~~~~
  compilation terminated.
  Makefile:25: recipe for target 'example' failed
  make: *** [example] Error 1
  
  user@ip:/opt/binacpp/example$ ^C
  user@ip:/opt/binacpp/example$ ./example.run.sh
  ./example: error while loading shared libraries: librtmp.so.0: cannot open shared object file: No such file or directory
  </code></pre>
  
  <p>I'm trying to figure out why I'm getting this error and what to do with it?</p>
  
  <p>1) It says on the readme that the dependencies are </p>
  
  <pre><code>  jsoncpp-1.8.3
    libcurl-7.56.0
    libwebsockets-2.4.0
  </code></pre>
  
  <p>However these are included in the repository</p>
  
  <p>2) if maybe it is assumed that openssl normally is already installed, how do I know which version to install? And how do I install this, because with Python you can just use pip and everything will be placed in the correct directories for including it in your program.</p>