Patch to gthumb-2.10.5 ebuild adding iptc USE flag to optionally use media-libs/libiptcdata to write gthumb comments into iptc fields. Also removes $(use_enable jpeg) from GCONF as --disable-jpeg does not exist.
Created attachment 127088 [details, diff] gthumb-2.10.5-iptc.patch
inCVS, thanks for reporting.