libxml2 and libreadline are not found

[Jason Stover]

configure saying I don't have libxml2 or readline, but I have them
both:

configure: WARNING: The following optional prerequisites are not installed.
You may wish to install them to obtain additional functionality:
        libxml2
        libreadline (which may itself require libncurses or libtermcap)

but I have libxml2:

$ ls /usr/local/lib/libxml2*
/usr/local/lib/libxml2.a              /usr/local/lib/libxml2.la*            
/usr/local/lib/libxml2.so.8.30*

$ ls /usr/lib/libreadline*    
/usr/lib/libreadline.a                /usr/lib/libreadline_p.a
/usr/lib/libreadline.so.3.0           /usr/lib/libreadline_pic.a


config.log is at http://math.gcsu.edu/~jhs/config.log, but it doesn't
say much about libxml2 or readline.

(I seem to remember having this problem before, but didn't see it on
the mail archives.)

-Jason