help with mail() function

[Bill Beck <bbeck@xxxxxxxxxxxx>]

Hello all,

I've compiled PHP5 on an Ubuntu machine. Getting this error when trying 
to use mail(), and have looked for the obvious problems:

error message:

*Fatal error*: Call to undefined function mail()

After running ./configure (as root) it shows that php found sendmail, 
and my admin panel confirms it's running:

checking for sendmail... (cached) /usr/sbin/sendmail

So sendmail is there, and the php_config.h file indeed shows #define 
HAVE_SENDMAIL 1
but no mail function.

Any thoughts?

Thanks,

Bill B