You may wish to create the following symbolic links:
ln -fs \
  /usr/local/share/examples/dejavu-fonts/20-unhint-small-dejavu-sans-mono.conf \
  /usr/local/share/examples/dejavu-fonts/20-unhint-small-dejavu-sans.conf \
  /usr/local/share/examples/dejavu-fonts/20-unhint-small-dejavu-serif.conf \
  /etc/fonts/conf.d

If you wish to make the DejaVu fonts the default fontconfig fonts, then
create the following symbolic links:
ln -fs \
  /usr/local/share/examples/dejavu-fonts/57-dejavu-sans-mono.conf \
  /usr/local/share/examples/dejavu-fonts/57-dejavu-sans.conf \
  /usr/local/share/examples/dejavu-fonts/57-dejavu-serif.conf \
  /etc/fonts/conf.d
