Emacs non-ascii characters

[John Russell]

I just compiled emacs from CVS a few weeks ago.  When I enter a double-quote 
and then some characters ( usually vowels ) the two characters get replaced
with some other character, like a 'u' with an umlaut or some other accent 
mark.  

I have been searching around for it but I don't even know what this "feature"
is called.  I looked in the emacs news ( C-h n ) and found something about
quail which I'm not sure is related.  

Anyway, how do I turn this off? I want to be able to type strings in code
again without accents.  Thanks.

John