libcurl upgrade may be required

[mpchadwick]

We found in at the check was failing due an out of date libcurl version. Default for CentOS 6 is 7.19. I appears that libcurl > 7.40 is required for TLSv1.2 support. There's a thread on this here. Just including this in case anyone else runs into this issue.

[braebot]

Thanks @mpchadwick. Do you think we should add a blurb about that in the main readme of this repo?

[remicollet]

Notice than TLSv1.2 is available on RHEL / CentOS 6 and 7 curl version :

• curl-7.19.7-43.el6
• curl-7.29.0-16.el7

    $ curl --version
    curl 7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.19.1 Basic ECC zlib/1.2.3 libidn/1.18 libssh2/1.4.2

    $ curl --tlsv1.2 -I https://tlstest.paypal.com/
    HTTP/1.1 200 OK

From PHP

$ php -r '
    defined("CURL_SSLVERSION_TLSv1_2") or define("CURL_SSLVERSION_TLSv1_2", 6);
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, "https://tlstest.paypal.com/");
    curl_setopt($ch, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1_2);
    var_dump(curl_exec($ch));'
PayPal_Connection_OKbool(true)

[braebot]

If you think we can update our readme, please submit a Pull Request. Thanks for your contribution!

[zx1986]

I got error with:

libcurl  7.19.7
NSS 3.12.9.0
libssh2   1.2.2