https://bugs.kde.org/show_bug.cgi?id=526896
Bug ID: 526896
Summary: Fontfconfig dependency needs update. It's outputting
warnings when run from CLI (kdenlive nightly 26.11.70
- rev. 9085b95)
Classification: Applications
Product: kdenlive
Version First git-master
Reported In:
Platform: Appimage
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Setup & Installation
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
DESCRIPTION
Starting nightly AppImage from CLI, I see output like this:
```
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 19: invalid
attribute 'xsi:nil'
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 20: invalid
constant used :
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 23: invalid
constant used : monospace
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 42: invalid
attribute 'xsi:nil'
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 43: invalid
constant used :
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 46: invalid
constant used : sans-serif
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 68: invalid
attribute 'xsi:nil'
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 69: invalid
constant used :
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 72: invalid
constant used : serif
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 88: invalid
attribute 'xsi:nil'
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 89: invalid
constant used :
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 92: invalid
constant used : emoji
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 108: invalid
attribute 'xsi:nil'
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 109: invalid
constant used :
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 112: invalid
constant used : math
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 120: invalid
attribute 'xsi:nil'
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 121: invalid
constant used :
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 124: invalid
constant used : system-ui
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 132: invalid
attribute 'xsi:nil'
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 133: invalid
constant used :
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 136: invalid
constant used : cursive
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 144: invalid
attribute 'xsi:nil'
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 145: invalid
constant used :
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 148: invalid
constant used : fantasy
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 156: invalid
attribute 'xsi:nil'
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 157: invalid
constant used :
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 160: invalid
constant used : ui-sans-serif
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 168: invalid
attribute 'xsi:nil'
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 169: invalid
constant used :
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 172: invalid
constant used : ui-serif
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 180: invalid
attribute 'xsi:nil'
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 181: invalid
constant used :
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 184: invalid
constant used : ui-monospace
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 192: invalid
attribute 'xsi:nil'
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 193: invalid
constant used :
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 196: invalid
constant used : ui-rounded
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 204: invalid
attribute 'xsi:nil'
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 205: invalid
constant used :
Fontconfig warning: "/etc/fonts/conf.d/48-guessfamily.conf", line 208: invalid
constant used : fangsong
Fontconfig warning: "/etc/fonts/conf.d/48-spacing.conf", line 14: invalid
constant used : monospace
Fontconfig warning: "/etc/fonts/conf.d/49-sansserif.conf", line 10: invalid
constant used : serif
Fontconfig warning: "/etc/fonts/conf.d/49-sansserif.conf", line 18: invalid
constant used : sans-serif
Fontconfig warning: "/etc/fonts/conf.d/49-sansserif.conf", line 26: invalid
constant used : monospace
Fontconfig warning: "/etc/fonts/conf.d/49-sansserif.conf", line 34: invalid
constant used : emoji
Fontconfig warning: "/etc/fonts/conf.d/49-sansserif.conf", line 42: invalid
constant used : math
```
OBSERVED RESULT
Warnings on CLI
EXPECTED RESULT
No warnings
SOFTWARE/OS VERSIONS
Kdenlive: 26.11.70
Kdenlive: 26.11.70 - rev. 9085b95
MLT: 7.43.0
FFmpeg: 8.1.1
KDE Frameworks: 6.30.0
Qt: Using 6.11.1 and built against 6.11.1
AppImage
Manjaro Linux (Wayland)
Build ABI: x86_64-little_endian-lp64
Kernel: linux 6.18.49-1-MANJARO
ADDITIONAL INFORMATION
This is a known issue in the opensource ecosystem. Here's an example from the
FreeCAD project:
> Caused because they've introduced those new xsi: tags in Fontconfig 2.18.0
> (https://lists.freedesktop.org/archives/fontconfig/2026-May/007334.html),
> dated May of this year (2026), and the AppImage lags behind
ref: https://github.com/FreeCAD/FreeCAD/issues/32429#issuecomment-5554420618
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