nixpkgs/pkgs/applications/misc/slic3r/fix-no-display.patch

diff --git a/Build.PL b/Build.PL
index 8b21c15..fd3aff0 100644
--- a/Build.PL
+++ b/Build.PL
@@ -33,9 +33,6 @@ my $sudo    = grep { $_ eq '--sudo' } @ARGV;
 my $gui     = grep { $_ eq '--gui' } @ARGV;
 my $xs_only = grep { $_ eq '--xs' }  @ARGV;
 if ($gui) {
-    %prereqs = qw(
-    Wx                              0.9918
-    );
     %recommends = qw(
     Growl::GNTP                     0.15
     Wx::GLCanvas                    0
diff --git a/lib/Slic3r/GUI.pm b/lib/Slic3r/GUI.pm
index 842ff44..ea0af64 100644
--- a/lib/Slic3r/GUI.pm
+++ b/lib/Slic3r/GUI.pm
@@ -26,7 +26,7 @@ use Slic3r::GUI::OptionsGroup::Field;
 use Slic3r::GUI::SimpleTab;
 use Slic3r::GUI::Tab;
 
-our $have_OpenGL = eval "use Slic3r::GUI::PreviewCanvas; 1";
+our $have_OpenGL = 0;
 
 use Wx 0.9901 qw(:bitmap :dialog :icon :id :misc :systemsettings :toplevelwindow
     :filedialog);
diff --git a/lib/Slic3r/GUI/Plater/2DToolpaths.pm b/lib/Slic3r/GUI/Plater/2DToolpaths.pm
index 8e48a72..7bed973 100644
--- a/lib/Slic3r/GUI/Plater/2DToolpaths.pm
+++ b/lib/Slic3r/GUI/Plater/2DToolpaths.pm
@@ -90,18 +90,20 @@ sub set_z {
 package Slic3r::GUI::Plater::2DToolpaths::Canvas;
 
 use Wx::Event qw(EVT_PAINT EVT_SIZE EVT_ERASE_BACKGROUND EVT_IDLE EVT_MOUSEWHEEL EVT_MOUSE_EVENTS);
-use OpenGL qw(:glconstants :glfunctions :glufunctions);
-use base qw(Wx::GLCanvas Class::Accessor);
-use Wx::GLCanvas qw(:all);
 use List::Util qw(min first);
 use Slic3r::Geometry qw(scale unscale epsilon);
 
 __PACKAGE__->mk_accessors(qw(print z layers color init dirty bb));
 
-# make OpenGL::Array thread-safe
-{
-    no warnings 'redefine';
-    *OpenGL::Array::CLONE_SKIP = sub { 1 };
+if ($Slic3r::GUI::have_OpenGL) {
+    use OpenGL qw(:glconstants :glfunctions :glufunctions);
+    use Wx::GLCanvas qw(:all);
+    use base qw(Wx::GLCanvas Class::Accessor);
+    # make OpenGL::Array thread-safe
+    {
+        no warnings 'redefine';
+        *OpenGL::Array::CLONE_SKIP = sub { 1 };
+    }
 }
 
 sub new {