Setup script is as follows:

./configure --with-mysql=/usr \
        --with-apxs \
        --with-config-file-path=/etc/httpd/conf \
        --enable-transid \
        --with-gdbm \
        --with-db \
        --with-imap \
        --with-gd=shared \
        --with-jpeg-dir=/usr \
        --with-xpm-dir=/usr

Gives debug.log message that ld cannot find -lX11, and fails on compile.  All X11 libs are installed and available in /usr/X11R6/lib.  Have tried with and without the --x-libraries and --x-includes switches for configure with the same result.  It's most likely something trivial that I'm overlooking.  Any ideas?