Update install docs to note new cmake requirements
@@ -30,7 +30,8 @@ directory of the source code tree as ``$source_directory``.
Make sure these are installed on your system before building OpenEXR:
-* OpenEXR requires CMake version 3.12 or newer (or autoconf on Linux systems).
+* OpenEXR requires CMake version 3.10 or newer (or autoconf on Linux systems).
+ - NB: CMake 3.12 is required for current PyIlmBase support
* C++ compiler that supports C++11
* Zlib
* Python and boost-python if building the PyIlmBase module.
