5 files changed, 33 insertions, 6 deletions
diff --git a/src/platform/emscripten/mod.rs b/src/platform/emscripten/mod.rs
index 1a78dfb..ce8d201 100644
--- a/src/platform/emscripten/mod.rs
+++ b/src/platform/emscripten/mod.rs
@@ -57,3 +57,8 @@ impl GlContext for HeadlessContext {
 
 unsafe impl Send for HeadlessContext {}
 unsafe impl Sync for HeadlessContext {}
+
+#[derive(Default)]
+pub struct PlatformSpecificWindowBuilderAttributes;
+#[derive(Default)]
+pub struct PlatformSpecificHeadlessBuilderAttributes;
diff --git a/src/platform/ios/mod.rs b/src/platform/ios/mod.rs
index aeaebc3..2e6fbec 100644
--- a/src/platform/ios/mod.rs
+++ b/src/platform/ios/mod.rs
@@ -8,12 +8,17 @@ use ContextError;
 
 pub use api::ios::*;
 
+#[derive(Default)]
+pub struct PlatformSpecificHeadlessBuilderAttributes;
+
 pub struct HeadlessContext(i32);
 
 impl HeadlessContext {
     /// See the docs in the crate root file.
-    pub fn new(_: (u32, u32), _: &PixelFormatRequirements, _: &GlAttributes<&HeadlessContext>)
-            -> Result<HeadlessContext, CreationError> {
+    pub fn new(_: (u32, u32), _: &PixelFormatRequirements, _: &GlAttributes<&HeadlessContext>,
+               _: &PlatformSpecificHeadlessBuilderAttributes)
+               -> Result<HeadlessContext, CreationError>
+    {
         unimplemented!()
     }
 
diff --git a/src/platform/linux/api_dispatch.rs b/src/platform/linux/api_dispatch.rs
index 2373770..2e135e2 100644
--- a/src/platform/linux/api_dispatch.rs
+++ b/src/platform/linux/api_dispatch.rs
@@ -22,6 +22,9 @@ use api::x11::XConnection;
 use api::x11::XError;
 use api::x11::XNotSupported;
 
+#[derive(Default)]
+pub struct PlatformSpecificWindowBuilderAttributes;
+
 enum Backend {
     X(Arc<XConnection>),
     Wayland,
@@ -172,7 +175,8 @@ impl<'a> Iterator for WaitEventsIterator<'a> {
 impl Window {
     #[inline]
     pub fn new(window: &WindowAttributes, pf_reqs: &PixelFormatRequirements,
-               opengl: &GlAttributes<&Window>) -> Result<Window, CreationError>
+               opengl: &GlAttributes<&Window>, _: &PlatformSpecificWindowBuilderAttributes)
+               -> Result<Window, CreationError>
     {
         match *BACKEND {
             Backend::Wayland => {
diff --git a/src/platform/linux/mod.rs b/src/platform/linux/mod.rs
index d010a89..9a9eb3f 100644
--- a/src/platform/linux/mod.rs
+++ b/src/platform/linux/mod.rs
@@ -12,13 +12,19 @@ use api::osmesa::{self, OsMesaContext};
 
 pub use self::api_dispatch::{Window, WindowProxy, MonitorId, get_available_monitors, get_primary_monitor};
 pub use self::api_dispatch::{WaitEventsIterator, PollEventsIterator};
+pub use self::api_dispatch::PlatformSpecificWindowBuilderAttributes;
 mod api_dispatch;
 
+#[derive(Default)]
+pub struct PlatformSpecificHeadlessBuilderAttributes;
+
 pub struct HeadlessContext(OsMesaContext);
 
 impl HeadlessContext {
     pub fn new(dimensions: (u32, u32), pf_reqs: &PixelFormatRequirements,
-               opengl: &GlAttributes<&HeadlessContext>) -> Result<HeadlessContext, CreationError>
+               opengl: &GlAttributes<&HeadlessContext>,
+               _: &PlatformSpecificHeadlessBuilderAttributes)
+               -> Result<HeadlessContext, CreationError>
     {
         let opengl = opengl.clone().map_sharing(|c| &c.0);
 
diff --git a/src/platform/windows/mod.rs b/src/platform/windows/mod.rs
index 246ca51..0c78322 100644
--- a/src/platform/windows/mod.rs
+++ b/src/platform/windows/mod.rs
@@ -51,6 +51,10 @@ lazy_static! {
     };
 }
 
+#[derive(Default)]
+pub struct PlatformSpecificWindowBuilderAttributes;
+#[derive(Default)]
+pub struct PlatformSpecificHeadlessBuilderAttributes;
 
 /// The Win32 implementation of the main `Window` object.
 pub struct Window(win32::Window);
@@ -59,7 +63,8 @@ impl Window {
     /// See the docs in the crate root file.
     #[inline]
     pub fn new(window: &WindowAttributes, pf_reqs: &PixelFormatRequirements,
-               opengl: &GlAttributes<&Window>) -> Result<Window, CreationError>
+               opengl: &GlAttributes<&Window>, _: &PlatformSpecificWindowBuilderAttributes)
+               -> Result<Window, CreationError>
     {
         win32::Window::new(window, pf_reqs, &opengl.clone().map_sharing(|w| &w.0),
                            EGL.as_ref().map(|w| &w.0)).map(|w| Window(w))
@@ -92,7 +97,9 @@ pub enum HeadlessContext {
 
 impl HeadlessContext {
     pub fn new(dimensions: (u32, u32), pf_reqs: &PixelFormatRequirements,
-               opengl: &GlAttributes<&HeadlessContext>) -> Result<HeadlessContext, CreationError>
+               opengl: &GlAttributes<&HeadlessContext>,
+               _: &PlatformSpecificHeadlessBuilderAttributes)
+               -> Result<HeadlessContext, CreationError>
     {
         // if EGL is available, we try using EGL first
         // if EGL returns an error, we try the hidden window method