```
mruby % doxygen -u
warning: Tag 'CLANG_ASSISTED_PARSING' at line 50 of file 'Doxyfile' belongs to an option that was not enabled at compile time.
This tag has been removed.
warning: Tag 'CLANG_OPTIONS' at line 51 of file 'Doxyfile' belongs to an option that was not enabled at compile time.
This tag has been removed.
warning: Tag 'TCL_SUBST' at line 238 of file 'Doxyfile' has become obsolete.
This tag has been removed.
warning: Tag 'COLS_IN_ALPHA_INDEX' at line 1075 of file 'Doxyfile' has become obsolete.
This tag has been removed.
warning: Tag 'FORMULA_TRANSPARENT' at line 1481 of file 'Doxyfile' has become obsolete.
This tag has been removed.
warning: Tag 'LATEX_SOURCE_CODE' at line 1769 of file 'Doxyfile' has become obsolete.
This tag has been removed.
warning: Tag 'RTF_SOURCE_CODE' at line 1851 of file 'Doxyfile' has become obsolete.
This tag has been removed.
warning: Tag 'DOCBOOK_PROGRAMLISTING' at line 1949 of file 'Doxyfile' has become obsolete.
This tag has been removed.
warning: Tag 'PERL_PATH' at line 2094 of file 'Doxyfile' has become obsolete.
This tag has been removed.
warning: Tag 'CLASS_DIAGRAMS' at line 2107 of file 'Doxyfile' has become obsolete.
This tag has been removed.
warning: Tag 'MSCGEN_PATH' at line 2116 of file 'Doxyfile' has become obsolete.
This tag has been removed.
warning: Tag 'DOT_FONTNAME' at line 2158 of file 'Doxyfile' has become obsolete.
This tag has been removed.
warning: Tag 'DOT_FONTSIZE' at line 2165 of file 'Doxyfile' has become obsolete.
This tag has been removed.
warning: Tag 'DOT_TRANSPARENT' at line 2391 of file 'Doxyfile' has become obsolete.
This tag has been removed.
Configuration file 'Doxyfile' updated.
```
mimaki