Minetest 64bit build cmake unsafe environment

~/src/minetest$ cmake . -DRUN_IN_PLACE=1 -DENABLE_LUAJIT=1
-- *** Will build version 0.4.12-dev ***
-- cURL support enabled.
-- GetText disabled.
-- Sound enabled.
-- Using GMP provided by system.
-- LevelDB backend enabled.
-- Using bundled JSONCPP library.
-- SpatialIndex not found!
-- Configuring done
CMake Warning at src/CMakeLists.txt:495 (add_executable):
  Cannot generate a safe runtime search path for target minetest because
  files in some directories may conflict with libraries in implicit
  directories:

    runtime library [libGLU.so] in /usr/lib/i386-linux-gnu may be hidden by files in:
      /usr/lib/x86_64-linux-gnu
    runtime library [libSM.so] in /usr/lib/i386-linux-gnu may be hidden by files in:
      /usr/lib/x86_64-linux-gnu
    runtime library [libICE.so] in /usr/lib/i386-linux-gnu may be hidden by files in:
      /usr/lib/x86_64-linux-gnu
    runtime library [libX11.so] in /usr/lib/i386-linux-gnu may be hidden by files in:
      /usr/lib/x86_64-linux-gnu
    runtime library [libXext.so] in /usr/lib/i386-linux-gnu may be hidden by files in:
      /usr/lib/x86_64-linux-gnu
    runtime library [libjpeg.so] in /usr/lib/i386-linux-gnu may be hidden by files in:
      /usr/lib/x86_64-linux-gnu
    runtime library [libpng.so] in /usr/lib/i386-linux-gnu may be hidden by files in:
      /usr/lib/x86_64-linux-gnu
    runtime library [libopenal.so] in /usr/lib/i386-linux-gnu may be hidden by files in:
      /usr/lib/x86_64-linux-gnu
    runtime library [libvorbisfile.so] in /usr/lib/i386-linux-gnu may be hidden by files in:
      /usr/lib/x86_64-linux-gnu
    runtime library [libvorbis.so] in /usr/lib/i386-linux-gnu may be hidden by files in:
      /usr/lib/x86_64-linux-gnu
    runtime library [libogg.so] in /usr/lib/i386-linux-gnu may be hidden by files in:
      /usr/lib/x86_64-linux-gnu
    runtime library [libgmp.so] in /usr/lib/i386-linux-gnu may be hidden by files in:
      /usr/lib/x86_64-linux-gnu
    runtime library [libXxf86vm.so] in /usr/lib/i386-linux-gnu may be hidden by files in:
      /usr/lib/x86_64-linux-gnu
    runtime library [libcurl.so] in /usr/lib/i386-linux-gnu may be hidden by files in:
      /usr/lib/x86_64-linux-gnu

  Some of these libraries may not be found correctly.


CMake Warning at src/CMakeLists.txt:558 (add_executable):
  Cannot generate a safe runtime search path for target minetestserver
  because files in some directories may conflict with libraries in implicit
  directories:

    runtime library [libgmp.so] in /usr/lib/i386-linux-gnu may be hidden by files in:
      /usr/lib/x86_64-linux-gnu
    runtime library [libcurl.so] in /usr/lib/i386-linux-gnu may be hidden by files in:
      /usr/lib/x86_64-linux-gnu

  Some of these libraries may not be found correctly.


-- Generating done
-- Build files have been written to: /home/robert/src/minetest