Simply protect the whole code in the SVG module file(s) with
#ifdef FT_CONFIG_OPTION_SVG
...
#endif
I tried this. But there's one problem with it. The `bzip2' module
doesn't expose anything apart from some functions. However,
my `svg' module exposes a renderer class with the name
`ft_svg_renderer_class'. This gets added in the list of the default
modules too. With the approach you suggested, This class
doesn't get exposed when the macro
FT_CONFIG_OPTION_SVG' isn't defined. That leads to an
`undefined reference' error.