-option('cdio', type : 'feature', value : 'auto', description : 'CD audio source plugin')
-option('dvdread', type : 'feature', value : 'auto', description : 'DVD video source plugin')
-option('mpeg2dec', type : 'feature', value : 'auto', description : 'MPEG 2 video decoder plugin')
-option('sidplay', type : 'feature', value : 'auto', description : 'Commodore 64 audio decoder plugin')
-option('x264', type : 'feature', value : 'auto', description : 'H.264 video encoder plugin')
+option('cdio', type : 'feature', value : 'auto', description : 'CD audio source plugin based on libcdio (GPL - only built if gpl option is also enabled!)')
+option('dvdread', type : 'feature', value : 'auto', description : 'DVD video source plugin based on libdvdread (GPL - only built if gpl option is also enabled!)')
+option('mpeg2dec', type : 'feature', value : 'auto', description : 'MPEG 2 video decoder plugin based on libmpeg2 (GPL - only built if gpl option is also enabled!)')
+option('sidplay', type : 'feature', value : 'auto', description : 'Commodore 64 audio decoder plugin based on libsidplay (GPL - only built if gpl option is also enabled!)')
+option('x264', type : 'feature', value : 'auto', description : 'H.264 video encoder plugin based on libx264 (GPL - only built if gpl option is also enabled!)')
+
+# License-related feature options
+option('gpl', type: 'feature', value: 'disabled', yield: true,
+ description: 'Allow build plugins that have GPL-licensed dependencies')