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$ cabal new-install HGL -j1
Resolving dependencies...
Build profile: -w ghc-8.6.2 -O1
In order, the following will be built (use -v for more details):
 - HGL-3.2.3.1 (lib:HGL) (requires build)
Warning: HGL.cabal:10:2: Tabs used as indentation at 10:2, 11:2, 12:2, 13:2,
14:2, 15:2, 16:2, 17:2
Configuring HGL-3.2.3.1...
Preprocessing library for HGL-3.2.3.1..
Building library for HGL-3.2.3.1..
[ 1 of 27] Compiling Graphics.HGL.Internals.Flag ( Graphics/HGL/Internals/Flag.hs, dist/build/Graphics/HGL/Internals/Flag.o )

Graphics/HGL/Internals/Flag.hs:17:1: warning: [-Wtabs]
    Tab character found here, and in three further locations.
    Please use spaces instead.
   |
17 |         ( Flag, newFlag, setFlag, resetFlag
   | ^^^^^^^^
[ 2 of 27] Compiling Graphics.HGL.Internals.Types ( Graphics/HGL/Internals/Types.hs, dist/build/Graphics/HGL/Internals/Types.o )

Graphics/HGL/Internals/Types.hs:63:9: warning: [-Wtabs]
    Tab character found here, and in 26 further locations.
    Please use spaces instead.
   |
63 |   | Dash        -- "-------"
   |         ^^^^^^^^
[ 3 of 27] Compiling Graphics.HGL.Internals.Utilities ( Graphics/HGL/Internals/Utilities.hs, dist/build/Graphics/HGL/Internals/Utilities.o )

Graphics/HGL/Internals/Utilities.hs:17:1: warning: [-Wtabs]
    Tab character found here, and in three further locations.
    Please use spaces instead.
   |
17 |         bracket, bracket_,
   | ^^^^^^^^
[ 4 of 27] Compiling Graphics.HGL.Units ( Graphics/HGL/Units.hs, dist/build/Graphics/HGL/Units.o )

Graphics/HGL/Units.hs:16:1: warning: [-Wtabs]
    Tab character found here, and in four further locations.
    Please use spaces instead.
   |
16 |         ( Point
   | ^^^^^^^^
[ 5 of 27] Compiling Graphics.HGL.X11.Display ( Graphics/HGL/X11/Display.hs, dist/build/Graphics/HGL/X11/Display.o )

Graphics/HGL/X11/Display.hs:3:1: warning: [-Wtabs]
    Tab character found here, and in four further locations.
    Please use spaces instead.
  |
3 |         ( getDisplayName
  | ^^^^^^^^
[ 6 of 27] Compiling Graphics.HGL.X11.Timer ( Graphics/HGL/X11/Timer.hs, dist/build/Graphics/HGL/X11/Timer.o )

Graphics/HGL/X11/Timer.hs:17:1: warning: [-Wtabs]
    Tab character found here, and in two further locations.
    Please use spaces instead.
   |
17 |         ( Timer, new, stop
   | ^^^^^^^^
[ 7 of 27] Compiling Graphics.HGL.X11.Types ( Graphics/HGL/X11/Types.hs, dist/build/Graphics/HGL/X11/Types.o )

Graphics/HGL/X11/Types.hs:17:1: warning: [-Wtabs]
    Tab character found here, and in 7 further locations.
    Please use spaces instead.
   |
17 |         ( DC(..)
   | ^^^^^^^^
[ 8 of 27] Compiling Graphics.HGL.Key ( Graphics/HGL/Key.hs, dist/build/Graphics/HGL/Key.o )

Graphics/HGL/Key.hs:16:1: warning: [-Wtabs]
    Tab character found here, and in 79 further locations.
    Please use spaces instead.
   |
16 |         ( Key                   -- Abstract!
   | ^^^^^^^^
[ 9 of 27] Compiling Graphics.HGL.Internals.Event ( Graphics/HGL/Internals/Event.hs, dist/build/Graphics/HGL/Internals/Event.o )

Graphics/HGL/Internals/Event.hs:17:1: warning: [-Wtabs]
    Tab character found here, and in 39 further locations.
    Please use spaces instead.
   |
17 |         ( Event(..)
   | ^^^^^^^^
[10 of 27] Compiling Graphics.HGL.Internals.Events ( Graphics/HGL/Internals/Events.hs, dist/build/Graphics/HGL/Internals/Events.o )

Graphics/HGL/Internals/Events.hs:23:68: error:
    Module ‘Control.Concurrent.Chan’ does not export ‘isEmptyChan’
   |
23 | import Control.Concurrent.Chan(Chan, newChan, readChan, writeChan, isEmptyChan)
   |                                                                    ^^^^^^^^^^^
Warning: Some package(s) failed to build. Try rerunning with -j1 if you can't
see the error.

Building     HGL-3.2.3.2 (all, legacy fallback)

Failed to build HGL-3.2.3.2.
Build log (
C:\Users\em162098\AppData\Roaming\cabal\logs\ghc-8.6.5\HGL-3.2.3.2-2d71f522644a0868a24a1353919ea3bb88e6662e.log
):
Preprocessing library for HGL-3.2.3.2..
Building library for HGL-3.2.3.2..
[ 1 of 26] Compiling Graphics.HGL.Internals.Flag ( Graphics\HGL\Internals\Flag.hs, dist\build\Graphics\HGL\Internals\Flag.o )

Graphics\HGL\Internals\Flag.hs:17:1: warning: [-Wtabs]
    Tab character found here, and in three further locations.
    Please use spaces instead.
   |
17 |         ( Flag, newFlag, setFlag, resetFlag
   | ^^^^^^^^
[ 2 of 26] Compiling Graphics.HGL.Internals.Types ( Graphics\HGL\Internals\Types.hs, dist\build\Graphics\HGL\Internals\Types.o )

Graphics\HGL\Internals\Types.hs:63:9: warning: [-Wtabs]
    Tab character found here, and in 26 further locations.
    Please use spaces instead.
   |
63 |   | Dash        -- "-------"
   |         ^^^^^^^^
[ 3 of 26] Compiling Graphics.HGL.Internals.Utilities ( Graphics\HGL\Internals\Utilities.hs, dist\build\Graphics\HGL\Internals\Utilities.o )

Graphics\HGL\Internals\Utilities.hs:17:1: warning: [-Wtabs]
    Tab character found here, and in three further locations.
    Please use spaces instead.
   |
17 |         bracket, bracket_,
   | ^^^^^^^^
[ 4 of 26] Compiling Graphics.HGL.Units ( Graphics\HGL\Units.hs, dist\build\Graphics\HGL\Units.o )

Graphics\HGL\Units.hs:16:1: warning: [-Wtabs]
    Tab character found here, and in four further locations.
    Please use spaces instead.
   |
16 |         ( Point
   | ^^^^^^^^
[ 5 of 26] Compiling Graphics.HGL.Win32.Types ( Graphics\HGL\Win32\Types.hs, dist\build\Graphics\HGL\Win32\Types.o )

Graphics\HGL\Win32\Types.hs:3:1: warning: [-Wtabs]
    Tab character found here, and in six further locations.
    Please use spaces instead.
  |
3 |         ( toDimension, fromDimension
  | ^^^^^^^^
[ 6 of 26] Compiling Graphics.HGL.Key ( Graphics\HGL\Key.hs, dist\build\Graphics\HGL\Key.o )

Graphics\HGL\Key.hs:16:1: warning: [-Wtabs]
    Tab character found here, and in 79 further locations.
    Please use spaces instead.
   |
16 |         ( Key                   -- Abstract!
   | ^^^^^^^^
[ 7 of 26] Compiling Graphics.HGL.Internals.Event ( Graphics\HGL\Internals\Event.hs, dist\build\Graphics\HGL\Internals\Event.o )

Graphics\HGL\Internals\Event.hs:17:1: warning: [-Wtabs]
    Tab character found here, and in 39 further locations.
    Please use spaces instead.
   |
17 |         ( Event(..)
   | ^^^^^^^^
[ 8 of 26] Compiling Graphics.HGL.Internals.Events ( Graphics\HGL\Internals\Events.hs, dist\build\Graphics\HGL\Internals\Events.o )

Graphics\HGL\Internals\Events.hs:17:1: warning: [-Wtabs]
    Tab character found here, and in one further location.
    Please use spaces instead.
   |
17 |         Events, newEvents, getEvent, sendEvent, isNoEvent,
   | ^^^^^^^^
[ 9 of 26] Compiling Graphics.HGL.Internals.Draw ( Graphics\HGL\Internals\Draw.hs, dist\build\Graphics\HGL\Internals\Draw.o )

Graphics\HGL\Internals\Draw.hs:17:1: warning: [-Wtabs]
    Tab character found here, and in 34 further locations.
    Please use spaces instead.
   |
17 |         ( Graphic       -- = Draw ()
   | ^^^^^^^^
[10 of 26] Compiling Graphics.HGL.Win32.Draw ( Graphics\HGL\Win32\Draw.hs, dist\build\Graphics\HGL\Win32\Draw.o )

Graphics\HGL\Win32\Draw.hs:3:1: warning: [-Wtabs]
    Tab character found here, and in six further locations.
    Please use spaces instead.
  |
3 |         ( DrawFun, drawGraphic, drawBufferedGraphic, drawBufferedGraphicBC
  | ^^^^^^^^
[11 of 26] Compiling Graphics.HGL.Win32.Bitmap ( Graphics\HGL\Win32\Bitmap.hs, dist\build\Graphics\HGL\Win32\Bitmap.o )

Graphics\HGL\Win32\Bitmap.hs:3:1: warning: [-Wtabs]
    Tab character found here, and in 17 further locations.
    Please use spaces instead.
  |
3 |         ( Bitmap
  | ^^^^^^^^
[12 of 26] Compiling Graphics.HGL.Draw.Monad ( Graphics\HGL\Draw\Monad.hs, dist\build\Graphics\HGL\Draw\Monad.o )

Graphics\HGL\Draw\Monad.hs:16:1: warning: [-Wtabs]
    Tab character found here, and in 9 further locations.
    Please use spaces instead.
   |
16 |         ( Graphic       -- = Draw ()
   | ^^^^^^^^
[13 of 26] Compiling Graphics.HGL.Draw.Text ( Graphics\HGL\Draw\Text.hs, dist\build\Graphics\HGL\Draw\Text.o )

Graphics\HGL\Draw\Text.hs:17:1: warning: [-Wtabs]
    Tab character found here, and in 27 further locations.
    Please use spaces instead.
   |
17 |         -- * Drawing text
   | ^^^^^^^^
[14 of 26] Compiling Graphics.HGL.Draw.Brush ( Graphics\HGL\Draw\Brush.hs, dist\build\Graphics\HGL\Draw\Brush.o )

Graphics\HGL\Draw\Brush.hs:16:1: warning: [-Wtabs]
    Tab character found here, and in 7 further locations.
    Please use spaces instead.
   |
16 |         ( Brush
   | ^^^^^^^^
[15 of 26] Compiling Graphics.HGL.Draw.Region ( Graphics\HGL\Draw\Region.hs, dist\build\Graphics\HGL\Draw\Region.o )

Graphics\HGL\Draw\Region.hs:16:1: warning: [-Wtabs]
    Tab character found here, and in 25 further locations.
    Please use spaces instead.
   |
16 |         ( Region
   | ^^^^^^^^
[16 of 26] Compiling Graphics.HGL.Draw.Picture ( Graphics\HGL\Draw\Picture.hs, dist\build\Graphics\HGL\Draw\Picture.o )

Graphics\HGL\Draw\Picture.hs:16:1: warning: [-Wtabs]
    Tab character found here, and in 22 further locations.
    Please use spaces instead.
   |
16 |         ( arc, ellipse, shearEllipse
   | ^^^^^^^^
[17 of 26] Compiling Graphics.HGL.Draw.Pen ( Graphics\HGL\Draw\Pen.hs, dist\build\Graphics\HGL\Draw\Pen.o )

Graphics\HGL\Draw\Pen.hs:25:1: warning: [-Wtabs]
    Tab character found here, and in 14 further locations.
    Please use spaces instead.
   |
25 |         ( Pen
   | ^^^^^^^^
[18 of 26] Compiling Graphics.HGL.Draw.Font ( Graphics\HGL\Draw\Font.hs, dist\build\Graphics\HGL\Draw\Font.o )

Graphics\HGL\Draw\Font.hs:26:1: warning: [-Wtabs]
    Tab character found here, and in 36 further locations.
    Please use spaces instead.
   |
26 |         ( Font
   | ^^^^^^^^
[19 of 26] Compiling Graphics.HGL.Draw ( Graphics\HGL\Draw.hs, dist\build\Graphics\HGL\Draw.o )

Graphics\HGL\Draw.hs:16:1: warning: [-Wtabs]
    Tab character found here, and in 16 further locations.
    Please use spaces instead.
   |
16 |         (
   | ^^^^^^^^
[20 of 26] Compiling Graphics.HGL.Win32.WND ( Graphics\HGL\Win32\WND.hs, dist\build\Graphics\HGL\Win32\WND.o )

Graphics\HGL\Win32\WND.hs:243:37: error:
    * Couldn't match type `Foreign.C.Types.CIntPtr'
                     with `GHC.Int.Int32'
      Expected type: LONG
        Actual type: LPARAM
    * In the expression: x
      In the first argument of `toPoint', namely `(x, y)'
      In the `pt' field of a record
    |
243 |         send (Button {pt = toPoint (x,y), isLeft=isLeft, isDown=isDown})
    |                                     ^

Graphics\HGL\Win32\WND.hs:243:39: error:
    * Couldn't match type `Foreign.C.Types.CIntPtr'
                     with `GHC.Int.Int32'
      Expected type: LONG
        Actual type: LPARAM
    * In the expression: y
      In the first argument of `toPoint', namely `(x, y)'
      In the `pt' field of a record
    |
243 |         send (Button {pt = toPoint (x,y), isLeft=isLeft, isDown=isDown})
    |                                       ^

Graphics\HGL\Win32\WND.hs:248:36: error:
    * Couldn't match type `Word' with `GHC.Word.Word32'
      Expected type: VKey
        Actual type: WPARAM
    * In the first argument of `MkKey', namely `wParam'
      In the `keysym' field of a record
      In the first argument of `send', namely
        `(Key {keysym = MkKey wParam, isDown = isDown})'
    |
248 |         send (Key { keysym = MkKey wParam, isDown = isDown })
    |                                    ^^^^^^

Graphics\HGL\Win32\WND.hs:260:41: error:
    * Couldn't match type `Foreign.C.Types.CIntPtr'
                     with `GHC.Int.Int32'
      Expected type: LONG
        Actual type: LPARAM
    * In the expression: x
      In the first argument of `toPoint', namely `(x, y)'
      In the `pt' field of a record
    |
260 |         send (MouseMove { pt = toPoint (x,y) })
    |                                         ^

Graphics\HGL\Win32\WND.hs:260:43: error:
    * Couldn't match type `Foreign.C.Types.CIntPtr'
                     with `GHC.Int.Int32'
      Expected type: LONG
        Actual type: LPARAM
    * In the expression: y
      In the first argument of `toPoint', namely `(x, y)'
      In the `pt' field of a record
    |
260 |         send (MouseMove { pt = toPoint (x,y) })
    |                                           ^
cabal.exe: Failed to build HGL-3.2.3.2 (which is required by exe:AutoMark from
AutoMark-1.0.0.0). See the build log above for details.