if we want to check for C++ includes, we should now check for cmath not math.h

# Basic system tests (standard libraries, headers, functions, types)   #

########################################################################

include(CheckIncludeFileCXX)

foreach(HEADER math.h)

foreach(HEADER cmath)

  check_include_file_cxx(${HEADER} FOUND_${HEADER})

  if(NOT FOUND_${HEADER})

    message(FATAL_ERROR "Could not find needed header - ${HEADER}")