Upgrad to version 1.1 that release by Gunnar Monell (http://fbgrab.monells.se).

Change log of version 1.1 :
 - Better handling of framebuffers with non-standard ordering of the colors.
 - Now handles framebuffer with larger line length than actually used.
 - Now handles supports screenshots where picture is not at the top of the framebuffer, i.e. applications using hardware flips.
 - Added -v to provide some verbosity on what fbgrab is doing.
 - Now #includes zlib.h to adjust to changes in libpng.