doc: update build instructions for lack of autodetection

Since we dropped autodetection of features in configure, these instructions
were incorrect.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

diff --git a/doc/building.dox b/doc/building.dox
index 9bafa32..94ea222 100644 (file)
--- a/doc/building.dox
+++ b/doc/building.dox
@@ -121,25 +121,21 @@ environment where tablet support is not required. libinput provides tablet
 support even without libwacom, but some features may be missing or working
 differently.
 
-@subsection buildling_event-gui Building the graphical helper tool
+@subsection buildling_event-gui Building without the graphical helper tool
 
 Only the commandline @ref tools are installed by distributions. The
 @ref event-gui graphical helper tools is only available in the source
 repository.
 
-The graphical helper tool is optional and requires extra libraries to build.
-If these libraries are not detected, the tool will not be built. If you need
-the tool for debugging purposes, use the ``--enable-event-gui`` argument
+The graphical helper tool is enabled by default but requires extra libraries
+to build. If these libraries are not available, the build will fail.
+If the tool is not required, use the ``--disable-event-gui`` argument
 when @ref building.
 
 @code
-$> ./autogen.sh --enable-event-gui --prefix=/usr --libdir=/usr/lib64
+$> ./autogen.sh --disable-event-gui --prefix=/usr --libdir=/usr/lib64
 @endcode
 
-As usual, any missing library headers will then trigger an error and can be
-addressed one-by-one.
-
-
 @section building_against Building against libinput
 
 libinput provides a