Seems like upstream switched from .tar.gz compressed source files to .zip
Created attachment 232415 [details, diff] gsoap-2.7.17.ebuild.patch
+*gsoap-2.7.17 (03 Jun 2010) +*gsoap-2.7.14 (03 Jun 2010) + + 03 Jun 2010; Lars Wendler <polynomial-c@gentoo.org> -gsoap-2.7.9f.ebuild, + -gsoap-2.7.12.ebuild, -gsoap-2.7.12-r1.ebuild, + -files/gsoap-2.7.12-fix-pre-iso-headers.patch, +gsoap-2.7.14.ebuild, + -gsoap-2.7.15.ebuild, +gsoap-2.7.17.ebuild, metadata.xml: + Version bumps to latest available version (2.7.17) and latest version + which works with virtualbox-ose (2.7.14). Removed old versions. Added + myself as maintainer. +