atlast today I got one blog which installed cURL on the system and nghttp and cURL do somewhat of same thing and need almost same dependencies. Infact in the installation of cURL nghttp is also installed.

so in cygwin, first openssl is installed then we need libev and many other softwares. all were to be installed through cygwin.

In computer networking, OpenSSL is a software library to be used in applications that need to secure communications against eavesdropping or need to ascertain the identity of the party at the other end. It has found wide use in internet web servers, serving a majority of all web sites.

OpenSSL contains an open-source implementation of the SSL and TLS protocols. The core library, written in the C programming language, implements basic cryptographic functions and provides various utility functions. Wrappers allowing the use of the OpenSSL library in a variety of computer languages are available.

Versions are available for most Unix and Unix-like operating systems (including Solaris, Linux, Mac OS X and the various open-source BSD operating systems), OpenVMS and Microsoft Windows. IBM provides a port for the System i(OS/400).

openssl takes musch time to build and install.