[CMake] failure to build Cmake to / against non-standard directory under Linux

[Chuck Atkins]

CMAKE_PREFIX_PATH just adds a set of search paths.  To instead have it
shift it's entire search infrastructure, you can use the
CMAKE_FIND_ROOT_PATH CMake variable and a few associated with it, which
will cause the entire set of search heuristics to be re-rooted in the
specified path.  First run the bootstrap step:

mkdir build
cd build
../bootstrap

Then use the bootstrapped CMake with the find root path settings:

./Bootstrap.mk/cmake \
  -DCMAKE_FIND_ROOT_PATH=/home/tools \
  -DCMAKE_FIND_ROOT_PATH_MODE_INCLUDE=ONLY \
  -DCMAKE_FIND_ROOT_PATH_MODE_LIBRARY=ONLY \
  -DCMAKE_FIND_ROOT_PATH_MODE_PACKAGE=ONLY \
  -DCMAKE_FIND_ROOT_PATH_MODE_PROGRAM=ONLY \
  -DCMAKE_USE_SYSTEM_LIBRARIES=ON \
  -DCMAKE_INSTALL_PREFIX=/home/tools \
  ..

make -j8

make install


- Chuck
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