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This isn't an answer per se (you and I've discussed this before!), but at least I thought I'd put the following as the relevant Trac ticket: http://trac.sagemath.org/sage_trac/ticket/8868

I am puzzled as to why your Ubuntu installation isn't compiling with png support, though. R install guide says

‘libX11’, ‘libX11-devel’, ‘libXt’ and ‘libXt-devel’.

is needed, but you are right that xorg-dev should give you this. In our spkg-install it says

if [ -f /usr/include/X11/Xwindows.h ]; then
    XSUPPORT=yes

so perhaps that isn't detecting your stuff. Thanks to David Kirkby, we also have

else
   if [ "x`uname`" = xSunOS ] && [ -f /usr/X11/lib/libXv.so ] ; then 
       XSUPPORT=yes

but that only would work on Solaris. We really just need to ask on r-devel about this; r-help has been of no help, but I've been reluctant to join r-devel since I know very little about R internals. But we just need to figure out what R precisely needs to allow png, and then have it compile every time those things are there.

This isn't an answer per se (you and I've discussed this before!), but at least I thought I'd put the following as the relevant Trac ticket: http://trac.sagemath.org/sage_trac/ticket/8868#8868.

I am puzzled as to why your Ubuntu installation isn't compiling with png support, though. R install guide says

‘libX11’, ‘libX11-devel’, ‘libXt’ and ‘libXt-devel’.

is needed, but you are right that xorg-dev should give you this. In our spkg-install it says

if [ -f /usr/include/X11/Xwindows.h ]; then
    XSUPPORT=yes

so perhaps that isn't detecting your stuff. Thanks to David Kirkby, we also have

else
   if [ "x`uname`" = xSunOS ] && [ -f /usr/X11/lib/libXv.so ] ; then 
       XSUPPORT=yes

but that only would work on Solaris. We really just need to ask on r-devel about this; r-help has been of no help, but I've been reluctant to join r-devel since I know very little about R internals. But we just need to figure out what R precisely needs to allow png, and then have it compile every time those things are there.