build01: building vwrbd9ghix0607yvkyx3pk4kjfq94shx-fonts.conf.drv
/nix/store/hcxw4cl6zlca0ci1hdfp2hc1dr5nbbg2-fontconfig-2.18.3/etc/fonts/fonts.conf:2: warning: failed to load external entity "urn:fontconfig:fonts.dtd"
<!DOCTYPE fontconfig SYSTEM "urn:fontconfig:fonts.dtd">
                                                       ^