Configure the project build tree.

ctest_configure([BUILD build_dir] [SOURCE source_dir] [APPEND]
                [OPTIONS options] [RETURN_VALUE res])

Configures the given build directory and stores results in Configure.xml. If no BUILD is given, the CTEST_BINARY_DIRECTORY variable is used. If no SOURCE is given, the CTEST_SOURCE_DIRECTORY variable is used. The OPTIONS argument specifies command line arguments to pass to the configuration tool. The RETURN_VALUE option specifies a variable in which to store the return value of the native build tool.

The APPEND option marks results for append to those previously submitted to a dashboard server since the last ctest_start. Append semantics are defined by the dashboard server in use.