+General options that are passed to the C++ compiler.
+The command line used to compile a C++ source file to an object file.
+The list of directories that the C preprocessor will search for include
+directories. The C/C++ implicit dependency scanner will search these
+directories for include files. Don't explicitly put include directory
+arguments in CCFLAGS or CXXFLAGS because the result will be non-portable
+and the directories will not be searched by the depedency scanner.