Can't compile gnucash 1.6.3, Unknown library 'libguppi', but...

[Tim Wunder]

Hi,
COL Workstaion 3.1, X4.1.0, KDE2.2.1, Gnome 1.4.??

In a continuing effort to compile and install gnucash 1.6.3, I've hit several 
roadblocks. Most I've overcome. I'm now stuck with the problem that the 
configure script for gnucash can't seem to locate libguppi.

I've compiled and installed the latest Guppi from source, 0.35.5. It was 
installed into /usr/local/include/libguppi. (I also seem to have a version of 
libguppi in /usr/include/libguppi -- and that could be part of my problem, I 
guess)

When I execute
./configure --prefix=/opt/gnucash 
--with-libguppi-prefix=/usr/local/include/libguppi

I get error messages "Unknown library 'libguppi'"

Some of my config.log follows:
configure:7329: gcc -o conftest -g -O2 -Wall -Wunused  -Wall -Wno-unused 
-Werror-implicit-function-declaration -I/usr/X11R6/include 
-I/usr/lib/glib/include   conftest.c -lm  -lm -rdynamic -L/usr/X11R6/lib 
-L/usr/lib -lgtk -lgdk -lgmodule -lglib -ldl -lXext -lX11 -lm 1>&5
In file included from configure:7322:
/usr/local/include/libguppi/guppi-useful.h:30: guppi-convenient.h: No such file 
or directory
/usr/local/include/libguppi/guppi-useful.h:31: guppi-debug.h: No such file or 
directory
/usr/local/include/libguppi/guppi-useful.h:32: guppi-dialogs.h: No such file or 
directory
/usr/local/include/libguppi/guppi-useful.h:33: guppi-defaults.h: No such file 
or directory
<snip 20 more>
configure: failed program was:

This seems to be saying to me, among other things, that there's a reference to 
"guppi-convenient.h" in line 30 of the file 
"/usr/local/include/libguppi/guppi-useful.h" and the configure script can't 
find it. But, it found "/usr/local/include/libguppi/guppi-useful.h" and 
"guppi-convenient.h" is in the same directory.

What gives? What step am I missing? What am I doing wrong?

Regards,
Tim