Hi,
I have GTK+ 2.13.6, and had problems compiling Inkscape 0.46, until I found this patch http://launchpadlibrarian.net/15113774/gtk-clist.patch. Inkscape compiled pretty well, but now the color values are gone wild :-P I can't raise any of the color components more than 245. Even the default colors (in the color bar) are semi transparents (the alpha channel is at 245).
I can write the HTML color "FF0000FF", and then the drawing turns solid red. But in the "fill and border" pannel, the values are at 245 (for red and alpha). If I try to change one of those values, they return to theier "correct" values (254), the image turns transparent again, and the HTML color shows "F50000F5".
Here is a screenshot: http://drmad.org/inkscape-245-problem.png
I've work with Inkscape 0.46 with a older GTK version without any problem. Help :(