Error: setup

Could not find a Makefile in the kernel source directory.
Please ensure that /usr/src/linux points to a complete set of Linux sources

Warn: setup

Unable to calculate Linux Kernel version for build, attempting to use running version

Log: setup

bindist enabled: H.264 video support will be disabled.

Log: postinst


Some web pages may require additional fonts to display properly.
Try installing some of the following packages if some characters
are not displayed properly:
- media-fonts/arphicfonts
- media-fonts/bitstream-cyberbit
- media-fonts/droid
- media-fonts/ipamonafont
- media-fonts/ja-ipafonts
- media-fonts/takao-fonts
- media-fonts/wqy-microhei
- media-fonts/wqy-zenhei

Depending on your desktop environment, you may need
to install additional packages to get icons on the Downloads page.

For KDE, the required package is kde-base/oxygen-icons.

For other desktop environments, try one of the following:
- x11-themes/gnome-icon-theme
- x11-themes/tango-icon-theme

(Note: Above message is only printed the first time package is
installed. Please look at /usr/share/doc/chromium-40.0.2214.91/README.gentoo*
for future reference)