drop inherit toolchain-funcs and DEPEND=virtual/pkgconfig, they are part of the udev.eclass
http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/media-gfx/argyllcms/argyllcms-1.4.0.ebuild?hideattic=0&r1=1.3&r2=1.4 vs. http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/media-gfx/argyllcms/argyllcms-1.4.0-r1.ebuild?r1=1.4&r2=1.5
actually, toolchain-funcs is necessary in argyllcms-1.4.0-r2 as "tc-export CC RANLIB" is used.
it should be fine to remove it from argyllcms-1.4.0-r1 though.
Thanks for the report! Current ebuilds in tree should be fixed now (>=1.4.0-r2 ebuilds kept the toolchain-funcs inherit)