This is the same bug as bug #4834(RC2). It is not fixed in the 4.0.0 release, so I submit this again with a bugfix.
There is one 'lib' too many in the configure script. Here is the diff output:

14964c14964
<               str="$IMAP_DIR/lib/lib$lib.*"
---
>               str="$IMAP_DIR/lib/$lib.*"


My configure line:

./configure --with-apxs=/usr/sbin/apxs \
            --prefix=/usr \
            --exec-prefix=/usr \
            --with-config-file-path=/etc/httpd \
            --disable-debug \
            --with-gd \
            --with-mysql \
            --with-zlib \
            --with-jpeg-dir=/usr \
            --with-imap=/usr
 
This is the same bug that caused my configure problems in RC1