Available fontconfig .conf files (* is enabled):
  [1]   10-autohint.conf
  [2]   10-no-sub-pixel.conf
  [3]   10-scale-bitmap-fonts.conf *
  [4]   10-sub-pixel-bgr.conf
  [5]   10-sub-pixel-rgb.conf *
  [6]   10-sub-pixel-vbgr.conf
  [7]   10-sub-pixel-vrgb.conf
  [8]   10-unhinted.conf
  [9]   11-lcdfilter-default.conf *
  [10]  11-lcdfilter-legacy.conf
  [11]  11-lcdfilter-light.conf
  [12]  20-unhint-small-dejavu-sans.conf
  [13]  20-unhint-small-dejavu-sans-mono.conf
  [14]  20-unhint-small-dejavu-serif.conf
  [15]  20-unhint-small-vera.conf *
  [16]  25-unhint-nonlatin.conf
  [17]  30-metric-aliases.conf *
  [18]  30-urw-aliases.conf *
  [19]  40-nonlatin.conf *
  [20]  45-latin.conf *
  [21]  49-sansserif.conf *
  [22]  50-user.conf
  [23]  51-local.conf *
  [24]  57-dejavu-sans.conf
  [25]  57-dejavu-sans-mono.conf
  [26]  57-dejavu-serif.conf
  [27]  60-latin.conf *
  [28]  65-fonts-persian.conf *
  [29]  65-khmer.conf
  [30]  65-nonlatin.conf *
  [31]  69-unifont.conf *
  [32]  70-no-bitmaps.conf
  [33]  70-yes-bitmaps.conf
  [34]  80-delicious.conf *
  [35]  90-synthetic.conf *
  [36]  99pdftoopvp.conf
cat /etc/fonts/conf.d/51-local.conf
<?xml version="1.0"?><!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
 <match target="font">
  <edit mode="assign" name="rgba">
   <const>rgb</const>
  </edit>
 </match>
 <match target="font">
  <edit mode="assign" name="hinting">
   <bool>true</bool>
  </edit>
 </match>
 <match target="font">
  <edit mode="assign" name="hintstyle">
   <const>hintslight</const>
  </edit>
 </match>
 <match target="font">
  <edit mode="assign" name="antialias">
   <bool>true</bool>
  </edit>
 </match>
</fontconfig>