# -DOXYGEN_ICONS=(Builtin|External) : If "Builtin" (the default), compile our Oxygen Icon Theme subset into the binary
# : If "External", we assume Oxygen is already installed on the system
# -DQUASSEL_ICONS=(Builtin|External) : If "Builtin" (the default), put our own icons into the binary
# -DOXYGEN_ICONS=(Builtin|External) : If "Builtin" (the default), compile our Oxygen Icon Theme subset into the binary
# : If "External", we assume Oxygen is already installed on the system
# -DQUASSEL_ICONS=(Builtin|External) : If "Builtin" (the default), put our own icons into the binary