compile error in control-center

[Anders Henriksson <andhe ida liu se>]

I don't know if this is the right place to ask but I have some problems 
compiling control-center-1.0.6 and the problem reocurs in gnome-core-1.0.9.

I have had an older version of gnome but it is all removed to make room for 
the new one except imagemagick which to my knowledge hasn't changed.

The problem is a simple matter of an undefined reference to an identifier  
__va_copy which I am not able to find. Does anyone know where this thing is 
defined?

/Anders

(I included some hints below)

gcc -g -O2 -Wall -Wunused -o .libs/session-properties-capplet chooser.o 
session-properties.o startup-programs.o gsm-protocol.o gsm-client-list.o 
gsm-client-row.o gsm-client-editor.o ../../control-center/.libs/libcapplet.so 
-L/usr/local/lib -lORBitCosNaming -lORBit -lIIOP -lORBitutil -lglib -lm -lm 
-ldl -L/usr/X11R6/lib -lgnorba -lORBitCosNaming -lORBit -lIIOP -lORBitutil 
-lgnomeui -lart_lgpl -lgdk_imlib -lSM -lICE -lgtk -lgdk -lgmodule -lXext -lX11 
-lgnome -lgnomesupport -lesd -laudiofile -lm -ldb -lglib -ldl -rdynamic 
-L/usr/local/lib -L/usr/X11R6/lib -L/usr/local/lib -lORBitCosNaming -lORBit 
-lIIOP -lORBitutil -lglib -lm -rdynamic -lgnomeui -lart_lgpl -lgdk_imlib -lSM 
-lICE -lgtk -lgdk -lgmodule -lXext -lX11 -lgnome -lgnomesupport -lesd 
-laudiofile -lm -ldb -lglib -ldl -lgnorba -Wl,--rpath -Wl,/usr/local/lib
gsm-protocol.o: In function `commandv':
/usr/local/src/gnome/control-center-1.0.6/capplets/session-properties/gsm-proto
col.c:673: undefined reference to `__va_copy'
gsm-protocol.o: In function `gsm_args_to_propv':
/usr/local/src/gnome/control-center-1.0.6/capplets/session-properties/gsm-proto
col.c:969: undefined reference to `__va_copy'
make[3]: *** [session-properties-capplet] Error 1

-- 
Anders Henriksson		tel: +46 13 288983
TCSLAB, IDA			fax: +46 13 282606
Linkopings Universitet		
S-581 83 Linkoping		E-Mail:	andhe@ida.liu.se 	
Sweden                		WWW:	http://www.ida.liu.se/~andhe/