DejaVu fonts

To use dejavu fonts by default:

emerge -av dejavu
eselect fontconfig enable 20-unhint-small-dejavu-sans-mono.conf  
eselect fontconfig enable 20-unhint-small-dejavu-sans.conf  
eselect fontconfig enable 20-unhint-small-dejavu-serif.conf  
eselect fontconfig enable 57-dejavu-sans.conf  
eselect fontconfig enable 57-dejavu-sans-mono.conf  
eselect fontconfig enable 57-dejavu-serif.conf

Liberation fonts

To use liberation fonts instead of the microsoft truetype fonts:

emerge -av liberation-fonts
eselect fontconfig enable 60-liberation.conf

Windows fonts

To use windows fonts by default:

echo "media-fonts/corefonts ~x86" >> /etc/portage/package.keywords/fonts
emerge -av corefonts  
eselect fontconfig disable 57-dejavu-sans.conf  
eselect fontconfig disable 57-dejavu-sans-mono.conf  
eselect fontconfig disable 57-dejavu-serif.conf  
eselect fontconfig disable 60-liberation.conf  
eselect fontconfig enable 58-corefonts.conf

Terminus font

To use the truetype font instead of the bitmap one:

echo "media-fonts/terminus-font ~x86" >> /etc/portage/package.keywords/fonts
emerge -av terminus-font  
eselect fontconfig enable 80-terminus.conf