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There are 2 versions of the Valve SDK.  The Full SDK (which includes single player support) and the Standard SDK (which includes multiplayer support).  If you are developing a multiplayer MOD you will only need the Standard SDK version.

To build the SDK you will need a C++ compiler.  Valve uses Microsoft Visual C++ Version 6.0.  You can also use one of two freely available C++ compilers.  You can use the free Borland C++ command line compiler or the free MinGW C++ compiler to build the SDK.

To develop a MOD, you will need to know how to write software in a programming language called C++.  If you are unfamiliar with C++, you should buy a book on C++ programming to become familiar with the C++ programming language before you attempt to make a MOD.

You might also want to see the MOD FAQ page on this web site.  It will answer many common questions about what you need to create a MOD and it contains links to many Internet resources to help you when creating a MOD.

To compile the SDK you will need to download the SDK 2.2 source code, download a set of patches from my website, and download the compiler that you wish to use.

The SDK can be downloaded from the valve-erc.com website or you can download them from local mirrors that I have created on fileplanet.com...

Half-Life Standard SDK 2.2 Source Code files

Half-Life Full SDK 2.2 Source Code files

The SDK 2.2 patches can be downloaded from here.

The Borland C++ compiler can be downloaded from here.

The MinGW C++ compiler can be download from here.

Read the ReadMe.txt file enclosed in the SDK 2.2 patches .zip file to get detailed information on how to install and configure the C++ compiler, how to install the patches to the SDK and how to configure the compiler to build the DLL files from the SDK source code.

If you want to see what I used to bypass the VGUI library (which makes building the client.dll file possible), you can download the source code that I used to build the NoVGUI.dll file here.