diff --git a/opts.inc b/opts.inc
index 32f4acc..db806e3 100755
--- a/opts.inc
+++ b/opts.inc
@@ -6,7 +6,7 @@
 // NOT COREGL, DEFINED LEGACY_INDEXING : uses indexed vertices and glDrawElements (medium efficiency)
 // NOT COREGL, NOT LEGACY_INDEXING : glCallList with redundant vertices (least efficient)
 
-{$DEFINE COREGL}
+//{$DEFINE COREGL}
 {$DEFINE LEGACY_INDEXING}
 {$DEFINE GEOM_GLEXT}
 //{$DEFINE HEMISSAO}  //for hemispherical SSAO - requires shaders that save surface normal - see hemiAO3 and hemiAO
diff --git a/prefs.pas b/prefs.pas
index 1425a7a..14c5296 100755
--- a/prefs.pas
+++ b/prefs.pas
@@ -23,7 +23,7 @@   TPrefs = record //ObjectBasedClipPlane,
     OverlayClip, StartupScript, SupportBetterRenderQuality, AdditiveOverlay,Perspective, OrientCube, MultiSample, BlackDefaultBackground,
      Colorbar,TracksAreTubes, ScreenCaptureTransparentBackground,LoadTrackOnLaunch,ColorBarPrecedenceTracksNotOverlays,HideDarkTracks, HideBrightTracks,
      OverlappingOverlaysOverwrite, ZDimIsUp,  ShaderForBackgroundOnly, CoreTrackDisableDepth, SkipPrefWriting, isFlipMeshOverlay, DarkMode,
-    RetinaDisplay, GenerateSmoothCurves {$IFDEF LINX}, isMesaWarned {$ENDIF} : boolean;
+    RetinaDisplay, GenerateSmoothCurves {$IFDEF LINUX}, isMesaWarned {$ENDIF} : boolean;
     TrackTubeSlices, ScreenCaptureZoom,ColorbarColor,ColorBarPosition,
     window_width, window_height, RenderQuality, 
     StartupWindowMode,