Update README.md

README.md

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 # fancontrol-gui
 GUI for Fancontrol. 
 It uses the KAuth module of the KDE Frameworks 5 to write the generated config file. 
-If you don't want to compile with KF5 set the compile option -DNO_KF5_KAUTH. 
+If you don't want to compile with KF5 set the option -DNO_KF5_KAUTH=true. 
 Furthermore it communicates with systemd via dbus to control the fancontrol service. 
-If you want to compile without systemd support set the -DNO_SYSTEMD option.
+If you want to compile without systemd support set the option -DNO_SYSTEMD=true.