%">Type:</td><td>UnquotedString</td>
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<td width="20%">Destination:</td><td>makefile_variable</td>
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<td width="20%">Description:</td><td>Preprocessor macros to undefine. Undefined macros are similar to defined macros, but replicate the "#undef" directive in source code. To undefine the macro FOO use the syntax "-u FOO" in this setting. This is equivalent to "#undef FOO" in a source file. Note: the syntax differs from macro definition (there is a space, i.e. "-u FOO