[CMake] test endian ness

[Vania Joloboff]

Hi

I am familiar with autoconf and trying to migrate our project to cmake.
Thus newbie. I am running cmake 3.2.2 on Linux Mint 17

I have seen in the documentation the macro
https://cmake.org/cmake/help/v3.2/module/TestBigEndian.html?highlight=endian#module:TestBigEndian

which seems very convenient for our purpose.
I have added to my CMakeLists.txt

TEST_BIG_ENDIAN(HOST_IS_BIG_ENDIAN)

But when I run
 > cmake -G "Unix Makefiles"

I get

CMake Error at CMakeLists.txt:11 (TEST_BIG_ENDIAN):
   Unknown CMake command "TEST_BIG_ENDIAN".

What am I missing ?

Thanks for clues...