this one works ok on Linux:

|GTK_THEME=Adwaita:dark gedit but lazarus ignores this setting?! ... i like a desktop dark theme, but not for lazarus. I would prefer ||GTK_THEME=Adwaita:light for lazarus Long time ago Michael Van Canneyt told us lazarus as gtk-App should be capable of theme per application basis?! But i can't find that in List-history. Any idea? |

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The GTK_THEME variable is recognized by Gtk 3. For Gtk 2 you need to set GTK2_RC_FILES to the gtkrc file for the theme you want. Your Gedit is build using Gtk 3. Lazarus is typically build on Linux using Gtk 2.

See also: https://wiki.archlinux.org/index.php/GTK+#Themes -------------- next part --------------
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 Thanks for that tipp!!

But the Arch-Wiki tells also:

Examples

GTK+ example configurations:

*Note:*May be ignored by somedesktop environments
<https://wiki.archlinux.org/index.php/Desktop_environments>(e.g.GNOME <https://wiki.archlinux.org/index.php/GNOME>).
... that also seems to be true for my Manjaro XFCE :-( Tried in vain to compile lazarus with gtk3 Widget style. I'll stay with general light theme!

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