Added "5.9 How does libcurl resolve host names?" since I wrote the text in

  5.6 What about Keep-Alive or persistent connections?

  5.7 Link errors when building libcurl on Windows!

  5.8 libcurl.so.3: open failed: No such file or directory

  5.9 How does libcurl resolve host names?

 6. License Issues

  6.1 I have a GPL program, can I use the libcurl library?

  'man ld.so' and 'man ld' will tell you more details

  5.9 How does libcurl resolve host names?

  libcurl includes a number of different name resolve functions:

  - The non-ipv6 resolver that can use one out of four host name resolve calls

    (depending on what your system supports):

    A - gethostbyname()

    B - gethostbyname_r() with 3 arguments

    C - gethostbyname_r() with 5 arguments

    D - gethostbyname_r() with 6 arguments

  - The ipv6-resolver that uses getaddrinfo()

  - The c-ares based name resolver that uses the c-ares library for resolves.

  - The Windows threaded resolver. It use:

    A - gethostbyname() on plain ipv4 windows hosts

    B - getaddrinfo() on ipv6-enabled windows hosts

6. License Issues