@Jozef: Perhaps you had better add an "exception" comment, otherwise (in theory) anyone except you who use it in an HL bot will be actually in violation of GPL...
Quote:
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6. Each time you redistribute the Program (or any work based on the Program), the recipient automatically receives a license from the original licensor to copy, distribute or modify the Program subject to these terms and conditions. You may not impose any further restrictions on the recipients' exercise of the rights granted herein. You are not responsible for enforcing compliance by third parties to this License.
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Valve's Half-Life SDK is Valve's proprietary program whose license surely has "further restrictions" so linking your code against Valve's SDK and release the result binary file is forbidden by GPL.
The "exception" comment is like this one: (taken from the Metamod source)
Code:
* In addition, as a special exception, the author gives permission to
* link the code of this program with the Half-Life Game Engine ("HL
* Engine") and Modified Game Libraries ("MODs") developed by Valve,
* L.L.C ("Valve"). You must obey the GNU General Public License in all
* respects for all of the code used other than the HL Engine and MODs
* from Valve. If you modify this file, you may extend this exception
* to your version of the file, but you are not obligated to do so. If
* you do not wish to do so, delete this exception statement from your
* version.