split the result of AC_ARG_WITH with a given token

[Vincent Torri]

Hey

AC_ARG_WITH sets a variable named loaders and set to (for example)
gif,tiff (actually, it's a comma separated list, there can be more
than 2 'elements')

What I want to do is plitting it into gif and tiff and manipulate those.

I know how to do that with m4_foreach ith an m4 list. But i don't know
what to do with just a variable.

what should i do ?

thank you

Vincent Torri