Can't find wxWidgets with wxWidgets_ROOT_DIR explicitly specified?

Question

CMake

wxWidgets is built via mingw and has install prefix = /usr/i686-mingw for example
In CMakeLists.txt I'm trying to find in a simple way:

find_package(wxWidgets COMPONENTS core base gl net REQUIRED)

before that
I set set(CMAKE_PREFIX_PATH /usr/i686-mingw)
set(wxWidgets_ROOT_DIR /opt/wxWidgets-3.1.0/build_windows_x32)
and it doesn't change anything, still find_package can't find library components

Answer 1

The reason was this:
Cmake 3.0 was significantly older than wxWidgets 3.1, around 2014 vs 2016 respectively.
Installed cmake 3.7 and one line
is enough