app-text/acroread is using the unpack function to extract .TAR files, however support for .TAR (upper-case) is a Portage-specific feature not in PMS and not supported by Pkgcore or Paludis, so it should be changed back to using tar xf. I've filed bug 476730 to allow this in a future EAPI, so hopefully it'll be available in the not-hugely-distant future.
Installation of acroread-9.5.5 fails for me under paludis, as unpack says it is "skipping" ILNXR.TAR and COMMON.TAR . Changing the line in the ebuild to "tar xf ./ILNXR.TAR; tar xf ./COMMON.TAR" works around the problem. However, what's strange is that acroread-9.5.4 had the identical ebuild, and it installed just fine under Paludis.
This is fixed in cvs: --- acroread-9.5.5.ebuild +++ acroread-9.5.5.ebuild @@ -87,7 +87,10 @@ src_unpack() { unpack ${A} cd "${S}" - unpack ./ILINXR.TAR ./COMMON.TAR + # lowercase tar extension required for unpack, bug 476734 + mv ./ILINXR.TAR ./ILINXR.tar || die + mv ./COMMON.TAR ./COMMON.tar || die + unpack ./ILINXR.tar ./COMMON.tar } src_prepare() {