Problems Building a Minetest-Server with FindGMP.cmake

Minetest cloned from : https://github.com/minetest/minetest.git

Found platforms with the same problem :

Debian Jessie
Ubuntu 15.04 (server)

Current platform : Ubuntu 15.04

All dependecies install as stated in https://github.com/minetest/minetest/blob/master/README.txt on line 105

dpkg -l | grep gmp

ii  libgmp-dev:amd64                    2:6.0.0+dfsg-6ubuntu1        amd64        Multiprecision arithmetic library developers tools
ii  libgmp10:amd64                      2:6.0.0+dfsg-6ubuntu1        amd64        Multiprecision arithmetic library
ii  libgmpxx4ldbl:amd64                 2:6.0.0+dfsg-6ubuntu1        amd64        Multiprecision arithmetic library (C++ bindings)

using
cmake BUILD_SERVER src/

-- cURL support enabled.
-- GetText disabled.
-- Freetype enabled.
CMake Error at CMakeLists.txt:146 (find_package):
  By not providing "FindGMP.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "GMP", but
  CMake did not find one.

  Could not find a package configuration file provided by "GMP" with any of
  the following names:

    GMPConfig.cmake
    gmp-config.cmake

  Add the installation prefix of "GMP" to CMAKE_PREFIX_PATH or set "GMP_DIR"
  to a directory containing one of the above files.  If "GMP" provides a
  separate development package or SDK, be sure it has been installed.


-- Configuring incomplete, errors occurred!
See also "/root/minetest/src/CMakeFiles/CMakeOutput.log".

locate -i FindGMP.cmake

minetest/cmake/Modules/FindGMP.cmake

locate -i gmpxx.h
/usr/include/gmpxx.h

All cmake configuration files have their original content..

Any help is appricated :)