bash-3.1$  grep -l libpng12.la /usr/lib64/*.la
/usr/lib64/libbeep.la
/usr/lib64/libbonoboui-2.la
/usr/lib64/libcddb-slave2.la
/usr/lib64/libcryptui.la
/usr/lib64/libdevhelp-1.la
/usr/lib64/libedataserverui-1.2.la
/usr/lib64/libeel-2.la
/usr/lib64/libgailutil.la
/usr/lib64/libgd.la
/usr/lib64/libgdict-1.0.la
/usr/lib64/libglade-2.0.la
/usr/lib64/libgladeui-1.la
/usr/lib64/libgnome-desktop-2.la
/usr/lib64/libgnome-media-profiles.la
/usr/lib64/libgnome-window-settings.la
/usr/lib64/libgnomecanvas-2.la
/usr/lib64/libgnomekbd.la
/usr/lib64/libgnomekbdui.la
/usr/lib64/libgnomeprintui-2-2.la
/usr/lib64/libgnomeui-2.la
/usr/lib64/libgtkhtml-2.la
/usr/lib64/libgtkhtml-3.14.la
/usr/lib64/libgtksourceview-1.0.la
/usr/lib64/libgtkspell.la
/usr/lib64/libgucharmap.la
/usr/lib64/libgweather.la
/usr/lib64/libloginhelper.la
/usr/lib64/libmetacity-private.la
/usr/lib64/libnautilus-burn.la
/usr/lib64/libnautilus-extension.la
/usr/lib64/libpanel-applet-2.la
/usr/lib64/libpangocairo-1.0.la
/usr/lib64/libpoppler-glib.la
/usr/lib64/libpoppler-qt.la
/usr/lib64/libpoppler.la
/usr/lib64/librsvg-2.la
/usr/lib64/libslab.la
/usr/lib64/libvte.la
/usr/lib64/libwnck-1.la