Configure can't find spread-sheet-widget

[Frans Houweling]

Hi,

 I have seamlessly installed spread-sheet-widget-0.6. I am running 
Slackware Linux. The configure for pspp-1.4 says:

"configure: error: The following required prerequisites are not installed.
You must install them before PSPP can be built:
    spread-sheet-widget 0.6 (or use --without-gui)"

pspp-1.4.0> whereis libspread-sheet-widget
libspread-sheet-widget: /usr/local/lib/libspread-sheet-widget.so 
/usr/local/lib/libspread-sheet-widget.la 
/usr/local/lib/libspread-sheet-widget.a

pspp-1.4.0> ls -l /usr/local/lib/libspread-sheet*
-rw-r--r-- 1 root root 1449220 Aug 18 16:57 
/usr/local/lib/libspread-sheet-widget.a
-rwxr-xr-x 1 root root    1045 Aug 18 16:57 
/usr/local/lib/libspread-sheet-widget.la
lrwxrwxrwx 1 root root      31 Aug 18 16:57 
/usr/local/lib/libspread-sheet-widget.so -> libspread-sheet-widget.so.0.0.0
lrwxrwxrwx 1 root root      31 Aug 18 16:57 
/usr/local/lib/libspread-sheet-widget.so.0 -> 
libspread-sheet-widget.so.0.0.0
-rwxr-xr-x 1 root root  726864 Aug 18 16:57 
/usr/local/lib/libspread-sheet-widget.so.0.0.0

I added /usr/local/lib to /etc/ld.so.conf and ran ldconfig, to no avail. 
I also tried renaming the libspread-sheet-widget.so files and links to 
have so --> so.0 --> so.0.6. No luck.

Any help appreciated! Thanks

frans