How to generate č (c-hachek) in KDE

[kwhiskerz]

I don't speak Czech, but I experimented on my keyboard. Mine is set to pc105, 
us intl (acentos) layout, both in xorg.conf and KDE Control Centre Keyboard 
Layout. You really only need the latter, but defining it in xorg.conf means 
all X programs know about the keyboard.

Type AltGr-Shift->, which produces a dead hachek, then type either lower or 
upper case 'c'. Voilà! AltGr is the right Alt key. Typing AltGr-Shift-> twice 
types the hachek without a letter underneath. All the dead keys work like 
this.

If you want to configure xorg.conf, this is what I have (adjust for your 
keyboard, but this is pretty generic):
Section "InputDevice"
        Identifier  "Keyboard0"
        Driver      "kbd"
        Option      "Xleds" "1 2 3"
        Option      "XkbModel" "pc105"
        Option      "XkbLayout" "us"
        Option      "XkbVariant" "us-acentos"
EndSection

us-acentos is fantastic! It should be the default, as accents are required in 
many English words or words commonly written in English, like voilà, naïve, 
pie à la mode, please apply with a résumé, etc.