Original commit message from CVS:
--enable-plugin-builddir means nothing to the plugins themselves, just the tools
AM_CONDITIONAL(HAVE_FIG2DEV_PNG, $HAVE_FIG2DEV_PNG)
AM_CONDITIONAL(HAVE_FIG2DEV_PDF, $HAVE_FIG2DEV_PDF)
AM_CONDITIONAL(HAVE_RAW1394, test "x$HAVE_RAW1394" = "xyes")
-AM_CONDITIONAL(PLUGINS_USE_BUILDDIR, test "x$PLUGINS_USE_BUILDDIR" = "xyes")
GST_CFLAGS="$GST_CFLAGS -I\$(top_srcdir)/gst-libs -Wall"
AC_SUBST(GST_LIBS)