Looks like libpst got a real home for itself. Attaching patch for the bump in a moment. Are you ok with gnome co-maintaining this. We need it for evolution plugin.
Created attachment 193082 [details, diff] libpst-0.6.37.ebuild.patch
+ 31 May 2009; Patrick Lauer <patrick@gentoo.org> +libpst-0.6.37.ebuild: + Bump to 0.6.37. Thanks to Gilles Dartiguelongue for the modifications. + Closes #272008 you missed a png useflag dep :)
thanks for the quick reaction.