>>>>> "s" == sentinel  <neil / sentinel.f9.co.uk> writes:

s> Ruby was installed automatically with the OS, so I downloaded the
s> source and grabbed the header files, but this message still appears,
s> even when I pass the --includedir option.

 See if ruby-devel is installed

 http://www.mandrakesoft.com/products/81/view?id=1854


Guy Decoux