I want to build my sources by Mingw compiler which in not placed on my system PATH.
I tried this in the beginning of my script:

```
set(Env{PATH} "c:/MyProject/Tools/mingw/bin/" "c:/MyProject/Tools/mingw/msys/1.0/bin/")

```

And this:

```
set(CMAKE_PROGRAM_PATH "c:/MyProject/Tools/mingw/bin/"   "c:/MyProject/Tools/mingw/msys/1.0/bin/")
set(CMAKE_LIBRARY_PATH "c:/MyProject/Tools/mingw/bin/" "c:/MyProject/Tools/mingw/msys/1.0/bin/")
set(CMAKE_SYSTEM_PROGRAM_PATH "c:/MyProject/Tools/mingw/bin/" "c:/MyProject/Tools/mingw/msys/1.0/bin/")
set(CMAKE_SYSTEM_PREFIX_PATH "c:/MyProject/Tools/mingw/bin/" "c:/MyProject/Tools/mingw/msys/1.0/bin/")

```

The first variant doesn't work at all. A suggest that I can't overwrite the value of the environment variable in CMake script.
The second script finds my mingw compiler, but catches the error while running gcc (can't find libgmp-10.dll which needs by gcc). This is because the PATH variable is not set to my Mingw.