whySSL_CTX_new () returns null pointer

[balaji ethiraja]

I tried to compile & run this program for secure conection
establishment. when i tried to compile and run this
SSL_CTX_new(SSLv23_client_method() returns only null pointer .how can
i avoid this error


#include "stdio.h"
#include "string.h"

int main()
{
    BIO * bio;
    SSL * ssl;
    SSL_CTX * ctx;

    int p;

    char * request = "GET / HTTP/1.1\x0D\x0AHost:
www.verisign.com\x0D\x0A\x43onnection: Close\x0D\x0A\x0D\x0A";
    char r[1024];

    /* Set up the library */

    ERR_load_BIO_strings();
    SSL_load_error_strings();
    OpenSSL_add_all_algorithms();

    /* Set up the SSL context */

   ctx = SSL_CTX_new(SSLv23_client_method());
        printf("%s",ctx);
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