Minimum version of CMake is 2.8, as advertised in the documentation.

glynos · glynos · commit 7af0122c5f64 · 2011-12-11T14:48:23.000+01:00
diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -3,7 +3,7 @@
 #    (See accompanying file LICENSE_1_0.txt or copy at
 #          http://www.boost.org/LICENSE_1_0.txt)
 
-cmake_minimum_required(VERSION 2.6)
+cmake_minimum_required(VERSION 2.8)
 project(CPP-NETLIB)
 set(Boost_USE_STATIC_LIBS ON)
 set(Boost_USE_MULTI_THREADED ON)
