How can I install openssl as a system file

[FERNAN]

Hello all,   I installed openssl (successfully) because I want to compile a Direct Connect API with Authorize.net which uses the openssl ssl.h header.   #include <openssl/ssl.h>   but the compiler does not know where to find the ssl.h header.  It seems like the openssl has to be installed as system file.  Does anyone knows how to install the openssl as a system file so that the compiler would know where to find the ssl.h header?   I would appreciate very much any input.   Fernan