From the links in this post by DingTo in the Brecht Easter Egg thingie (Cycles):
Blender Trunk now has full Open Shading Language Support + Custom Shaders!
I gather that the version of Boost in svn is still 1.34, under:
you'll find a reference to:
+ find_package(Boost 1.34
COMPONENTS filesystem regex system thread) mark_as_advanced(Boost_DIR) # why doesnt boost do this?
Boost is currently at 1.51.
I'm suspecting that oiio is also at a version that predates support for jpgs. Any reason why? [/u]
Blender now builds against your system Boost libraries. I have Boost 1.49 installed under Debian Unstable; there is also the option of 1.50, but thatís not compatible with the distro-supplied OpenImageIO package.