Makefiles generated by Automake 1.11 attempt to install related files together in order to speed up the installation process.  Thus gnome-themes from git master fails with:

 /home/yavor/bin/install-check -m 644 stock_zoom-out.png stock_yes.png stock_no.png stock_dnd.png stock_dnd_multiple.png stock_run.png stock_searchtool.png stock_lockscreen.png stock_logout.png stock_gnome-logo.png stock_cde-menu.png stock_internet.png stock_gnome-util.png stock_launcher-program.png stock_multimedia.png stock_drawer.png stock_screenshot.png stock_amusements.png stock_accessories.png stock_commandline-browser.xpm stock_commandline-history.xpm media-prev.png media-next.png media-stop.png media-eject.png media-play.png media-pause.png media-record.png media-backward.png media-forward.png media-backward.png media-forward.png volume-mute.png volume-zero.png volume-min.png volume-medium.png volume-max.png double-click-on.png double-click-off.png double-click-maybe.png '/home/yavor/gnome-trunk/share/themes/HighContrastLargePrint/pixmaps'
install: will not overwrite just-created `/home/yavor/gnome-trunk/share/themes/HighContrastLargePrint/pixmaps/media-backward.png' with `media-backward.png'
install: will not overwrite just-created `/home/yavor/gnome-trunk/share/themes/HighContrastLargePrint/pixmaps/media-forward.png' with `media-forward.png'
make[4]: *** [install-pixmapDATA] Error 1