Building metacity-2.15.2-2 in mock fails:

if gcc -DHAVE_CONFIG_H -I. -I. -I.. -I/usr/include/glib-2.0
-I/usr/lib64/glib-2.0/include       -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2
-fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -MT
overlaytest.o -MD -MP -MF ".deps/overlaytest.Tpo" -c -o overlaytest.o
overlaytest.c; \
then mv -f ".deps/overlaytest.Tpo" ".deps/overlaytest.Po"; else rm -f
".deps/overlaytest.Tpo"; exit 1; fi
overlaytest.c:1:19: error: cm/ws.h: No such file or directory
overlaytest.c: In function 'main':
overlaytest.c:6: warning: implicit declaration of function 'g_type_init'
overlaytest.c:8: error: 'WsDisplay' undeclared (first use in this function)
overlaytest.c:8: error: (Each undeclared identifier is reported only once
overlaytest.c:8: error: for each function it appears in.)
overlaytest.c:8: error: 'display' undeclared (first use in this function)
overlaytest.c:8: warning: implicit declaration of function 'ws_display_new'
overlaytest.c:8: error: 'NULL' undeclared (first use in this function)
overlaytest.c:9: error: 'WsScreen' undeclared (first use in this function)
overlaytest.c:9: error: 'screen' undeclared (first use in this function)
overlaytest.c:9: warning: implicit declaration of function
'ws_display_get_default_screen'
overlaytest.c:10: error: 'WsWindow' undeclared (first use in this function)
overlaytest.c:10: error: 'root' undeclared (first use in this function)
overlaytest.c:10: warning: implicit declaration of function
'ws_screen_get_root_window'
overlaytest.c:11: error: 'overlay' undeclared (first use in this function)
overlaytest.c:13: warning: implicit declaration of function
'ws_display_init_composite'
overlaytest.c:15: warning: implicit declaration of function
'ws_window_redirect_subwindows'
overlaytest.c:17: warning: implicit declaration of function
'ws_screen_get_gl_window'
overlaytest.c:19: warning: implicit declaration of function 'g_print'
make[3]: *** [overlaytest.o] Error 1
make[3]: Leaving directory `/builddir/build/BUILD/metacity-2.15.2/libcm-0.0.19/src'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/builddir/build/BUILD/metacity-2.15.2/libcm-0.0.19/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/builddir/build/BUILD/metacity-2.15.2/libcm-0.0.19'
make: *** [all] Error 2
error: Bad exit status from /var/tmp/rpm-tmp.18916 (%build)

As ws.h is supplied by metacity, this looks like a circular dependency.
A build-log is attached.