Require at least Clang 3.3.

doc/building.dox

@@ -38,7 +38,7 @@ namespace Magnum {
 Minimal set of tools and libraries required for building is:
 
 -   C++ compiler with good C++11 support. Compilers which are tested to have
-    everything needed are **GCC** >= 4.8.1, **Clang** >= 3.1 and **MSVC**
+    everything needed are **GCC** >= 4.8.1, **Clang** >= 3.3 and **MSVC**
     >= 2015. On Windows you can also use **MinGW-w64**.
 -   **CMake** >= 2.8.12
 -   **Corrade** --- Plugin management and utility library. See

doc/changelog.dox

@@ -41,7 +41,8 @@ See also:
 @subsection changelog-latest-dependencies Dependency changes
 
 -   Minimal supported GCC version is now 4.8.1, GCC 4.7 is not supported
-    anymore.
+    anymore. Minimal Clang version is now 3.3, since that's the first version
+    with a complete C++11 support.
 
 @subsection changelog-latest-new New features