gnome-core 1.0.6 compile failure

[Torsten Howard <torsten inetw net>]

make[2]: Entering directory `/usr/home/torsten/.src/gnome/gnome-core-1.0.6/gsm'
/bin/sh ../libtool --mode=link gcc  -g -O2 -Wall -Wno-unused   -o session-properties
session-properties.o gsm-client-list.o gsm-client-editor.o gsm-client-row.o
gsm-protocol.o -rdynamic -L/usr/local/gnome/lib -L/usr/local/lib -L/usr/X11R6/lib
-rdynamic -lgnomeui -lart_lgpl -lgdk_imlib -lSM -lICE -lgtk -lgdk -lgmodule -lintl
-lXext -lX11 -lgnome -lgnomesupport -lesd -laudiofile -lm -ldb -lglib -ldl  
gcc -g -O2 -Wall -Wno-unused -o session-properties session-properties.o
gsm-client-list.o gsm-client-editor.o gsm-client-row.o gsm-protocol.o -rdynamic
-L/usr/local/gnome/lib -L/usr/local/lib -L/usr/X11R6/lib -rdynamic -lgnomeui -lart_lgpl
-lgdk_imlib -lSM -lICE -lgtk -lgdk -lgmodule -lintl -lXext -lX11 -lgnome -lgnomesupport
-lesd -laudiofile -lm -ldb -lglib -ldl
gsm-protocol.o: In function `commandv':
/usr/home/torsten/.src/gnome/gnome-core-1.0.6/gsm/gsm-protocol.c:673: undefined
reference to `__va_copy'
gsm-protocol.o: In function `gsm_args_to_propv':
/usr/home/torsten/.src/gnome/gnome-core-1.0.6/gsm/gsm-protocol.c:969: undefined
reference to `__va_copy'
make[2]: *** [session-properties] Error 1
make[2]: Leaving directory `/usr/home/torsten/.src/gnome/gnome-core-1.0.6/gsm'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/usr/home/torsten/.src/gnome/gnome-core-1.0.6'
make: *** [all-recursive-am] Error 2
bigdell:/usr/home/torsten/.src/gnome/gnome-core-1.0.6# 



Anyone know what __va_copy is, and what it is a part of?  Or do I need to
investigate?
I have Slackware 4.0, fresh install, see attached file for libs available.
Gnome-libs 1.0.10, gnome-core 1.0.6, libc5
torsten

libs.txt