This is what happens when I build gst-plugins with jhbuild in a clean tree:

make[3]: Entering directory `/home/ep/gnome/gst-plugins/gst/colorspace'
..
 gcc -DHAVE_CONFIG_H -I. -I. -I../.. -I../../gst-libs -D_LARGEFILE_SOURCE
-D_FILE_OFFSET_BITS=64 -pthread -I/home/ep/gnome/test/include/gstreamer-0.7
-I/home/ep/gnome/test/include/glib-2.0
-I/home/ep/gnome/test/lib/glib-2.0/include
-I/home/ep/gnome/test/include/libxml2 -DGST_DISABLE_DEPRECATED -Wall
-Werror -DG_DISABLE_DEPRECATED -g -O2 -MT
libgstcolorspace_la-gstcolorspace.lo -MD -MP -MF
.deps/libgstcolorspace_la-gstcolorspace.Tpo -c gstcolorspace.c  -fPIC -DPIC
-o .libs/libgstcolorspace_la-gstcolorspace.o
gstcolorspace.c:31: warning: implicit declaration of function
`GST_VIDEO_YUV_PAD_TEMPLATE_CAPS'
gstcolorspace.c:31: error: initializer element is not constant
gstcolorspace.c:31: error: (near initialization for
`gst_colorspace_formats[0].caps.string')
gstcolorspace.c:31: error: initializer element is not constant
gstcolorspace.c:31: error: (near initialization for
`gst_colorspace_formats[0].caps')
gstcolorspace.c:31: error: initializer element is not constant
gstcolorspace.c:31: error: (near initialization for
`gst_colorspace_formats[0]')
gstcolorspace.c:32: error: initializer element is not constant
gstcolorspace.c:32: error: (near initialization for
`gst_colorspace_formats[1].caps.caps')
gstcolorspace.c:32: error: initializer element is not constant
gstcolorspace.c:32: error: (near initialization for
`gst_colorspace_formats[1].caps.string')
gstcolorspace.c:32: error: initializer element is not constant
gstcolorspace.c:32: error: (near initialization for
`gst_colorspace_formats[1].caps')
gstcolorspace.c:32: error: initializer element is not constant
gstcolorspace.c:32: error: (near initialization for
`gst_colorspace_formats[1]')
gstcolorspace.c:33: error: initializer element is not constant
gstcolorspace.c:33: error: (near initialization for
`gst_colorspace_formats[2].caps.caps')
gstcolorspace.c:33: error: `GST_VIDEO_RGB_PAD_TEMPLATE_CAPS_32' undeclared
here (not in a function)
gstcolorspace.c:33: error: initializer element is not constant
gstcolorspace.c:33: error: (near initialization for
`gst_colorspace_formats[2].caps.string')
gstcolorspace.c:33: error: initializer element is not constant
gstcolorspace.c:33: error: (near initialization for
`gst_colorspace_formats[2].caps')
gstcolorspace.c:33: error: initializer element is not constant
gstcolorspace.c:33: error: (near initialization for
`gst_colorspace_formats[2]')
gstcolorspace.c:34: error: initializer element is not constant
gstcolorspace.c:34: error: (near initialization for
`gst_colorspace_formats[3].caps.caps')
gstcolorspace.c:34: error: `GST_VIDEO_RGB_PAD_TEMPLATE_CAPS_24' undeclared
here (not in a function)
gstcolorspace.c:34: error: initializer element is not constant
gstcolorspace.c:34: error: (near initialization for
`gst_colorspace_formats[3].caps.string')
gstcolorspace.c:34: error: initializer element is not constant
gstcolorspace.c:34: error: (near initialization for
`gst_colorspace_formats[3].caps')
gstcolorspace.c:34: error: initializer element is not constant
gstcolorspace.c:34: error: (near initialization for
`gst_colorspace_formats[3]')
gstcolorspace.c:35: error: initializer element is not constant
gstcolorspace.c:35: error: (near initialization for
`gst_colorspace_formats[4].caps.caps')
gstcolorspace.c:35: error: `GST_VIDEO_RGB_PAD_TEMPLATE_CAPS_16' undeclared
here (not in a function)
gstcolorspace.c:35: error: initializer element is not constant
gstcolorspace.c:35: error: (near initialization for
`gst_colorspace_formats[4].caps.string')
gstcolorspace.c:35: error: initializer element is not constant
gstcolorspace.c:35: error: (near initialization for
`gst_colorspace_formats[4].caps')
gstcolorspace.c:35: error: initializer element is not constant
gstcolorspace.c:35: error: (near initialization for
`gst_colorspace_formats[4]')
gstcolorspace.c:55: error: initializer element is not constant
gstcolorspace.c:55: error: (near initialization for
`gst_colorspace_sink_template.static_caps.string')
gstcolorspace.c:55: error: initializer element is not constant
gstcolorspace.c:55: error: (near initialization for
`gst_colorspace_sink_template.static_caps')
gstcolorspace.c:63: error: `GST_VIDEO_RGB_PAD_TEMPLATE_CAPS_32' undeclared
here (not in a function)
gstcolorspace.c:63: error: initializer element is not constant
gstcolorspace.c:63: error: (near initialization for
`gst_colorspace_src_template.static_caps.string')
gstcolorspace.c:63: error: parse error before string constant
gstcolorspace.c:63: error: initializer element is not constant
gstcolorspace.c:63: error: (near initialization for
`gst_colorspace_src_template.static_caps')
make[3]: *** [libgstcolorspace_la-gstcolorspace.lo] Error 1
make[3]: Leaving directory `/home/ep/gnome/gst-plugins/gst/colorspace'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/home/ep/gnome/gst-plugins/gst'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/ep/gnome/gst-plugins'
make: *** [all] Error 2

Built OK yesterday