GTK+ compile failure - 1/11/99 Snaps

[Timothy Lewis <tlewis digaudio com>]

GTK+ failed at the following point from jimpick.com's 1/11/99 snapshot 
of 'gnome':

Making all in gdk
make[2]: Entering directory `/usr/local/src/gnome/gtk+/gdk'
/bin/sh ../libtool --mode=compile gcc -DHAVE_CONFIG_H -I. -I. -I.. 
-DG_LOG_DOMAIN=\"Gdk\" -I.. -DGTK_NO_CHECK_CASTS -DUSE_XIM 
-I/usr/lib/glib/include -D_REENTRANT -I/usr/X11R6/include   -g -O2 
-Wall -c gdk.c
gcc -DHAVE_CONFIG_H -I. -I. -I.. -DG_LOG_DOMAIN=\"Gdk\" -I.. 
-DGTK_NO_CHECK_CASTS -DUSE_XIM -I/usr/lib/glib/include -D_REENTRANT 
-I/usr/X11R6/include -g -O2 -Wall -Wp,-MD,.deps/gdk.p -c -fPIC -DPIC gdk.c
In file included from gdk.c:38:
gdk.h:965: parse error before `*'
gdk.h:965: warning: data definition has no type or storage class
gdk.c: In function `gdk_init':
gdk.c:151: warning: implicit declaration of function 
`g_thread_supported'
gdk.c:152: warning: implicit declaration of function `g_mutex_new'
gdk.c:152: warning: assignment makes pointer from integer without a 
cast
gdk.c: In function `gdk_threads_enter':
gdk.c:1241: warning: implicit declaration of function `g_mutex_lock'
gdk.c: In function `gdk_threads_leave':
gdk.c:1247: warning: implicit declaration of function `g_mutex_unlock'
make[2]: *** [gdk.lo] Error 1
make[2]: Leaving directory `/usr/local/src/gnome/gtk+/gdk'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/usr/local/src/gnome/gtk+'
make: *** [all-recursive-am] Error 2

The machine is a Linux box running 5.1 with updates.

Is this a new thing?  I haven't seen this failure before.

Tim