title: Fail to run cmake with cygwin
body: <p>I am having a problem with cmake under cygwin. I installed the cygwin's CMake package AND the normal CMake package (in windows) and every time I run CMake to configure a project it displays the following:</p>
  
  <pre><code>$ CMake Error: CMake was unable to find a build program corresponding to "Unix Makefiles".  CMAKE_MAKE_PROGRAM is not set.  You probably need to select a different build tool.
  Missing variable is:
  CMAKE_C_COMPILER_ENV_VAR
  CMake Error: Error required internal CMake variable not set, cmake may be not be built correctly.
  Missing variable is:
  CMAKE_C_COMPILER
  CMake Error: Could not find cmake module file:/home/LordEvil/build/CMakeFiles/CMakeCCompiler.cmake
  CMake Error: Error required internal CMake variable not set, cmake may be not be built correctly.
  Missing variable is:
  CMAKE_CXX_COMPILER_ENV_VAR
  CMake Error: Error required internal CMake variable not set, cmake may be not be built correctly.
  Missing variable is:
  CMAKE_CXX_COMPILER
  CMake Error: Could not find cmake module file:/home/LordEvil/build/CMakeFiles/CMakeCXXCompiler.cmake
  CMake Error: CMAKE_C_COMPILER not set, after EnableLanguage
  CMake Error: CMAKE_CXX_COMPILER not set, after EnableLanguage
  -- Configuring incomplete, errors occurred!
  CMake Error: The source directory "/home/LordEvil/build/tool." does not exist.
  Specify --help for usage, or press the help button on the CMake GUI.
  </code></pre>
  
  <p>What is this problem? Can anyone help to resolve this problem?</p>