Description of problem:
When I try to include the header file /usr/include/Poco/Crypto/OpenSSLInitializer.h inside a source file and then compile it, I get the following error:

In file included from /usr/include/Poco/Crypto/X509Certificate.h:24:0,
                 from /usr/include/Poco/Net/Context.h:25,
                 from /usr/include/Poco/Net/Utility.h:24,
                 from /usr/include/Poco/Net/HTTPSClientSession.h:24,
                 from main.cpp:11:
/usr/include/Poco/Crypto/OpenSSLInitializer.h:26:28: fatal error: openssl/crypto.h: No such file or directory
 #include <openssl/crypto.h>

Version-Release number of selected component (if applicable):
1.7.3-5

How reproducible:
always, consistently, systematically

Steps to Reproduce:
1. Create a source cpp file(let's name it poco-dev-test.cpp) with the following single line:

#include <Poco/Crypto/X509Certificate.h>

2. Compile the file using this command.

make poco-dev-test.o

Actual results:
g++    -c -o poco-dev-test.o poco-dev-test.cpp
In file included from /usr/include/Poco/Crypto/X509Certificate.h:24:0,
                 from poco-dev-test.cpp:1:
/usr/include/Poco/Crypto/OpenSSLInitializer.h:26:28: fatal error: openssl/crypto.h: No such file or directory
 #include <openssl/crypto.h>
                            ^
compilation terminated.
<builtin>: recipe for target 'poco-dev-test.o' failed
make: *** [poco-dev-test.o] Error 1

Expected results:
g++    -c -o poco-dev-test.o poco-dev-test.cpp

Additional info: