gistfile1.txt

diff --git a/pyo3-build-config/src/impl_.rs b/pyo3-build-config/src/impl_.rs
index a473f888..e57204f2 100644
--- a/pyo3-build-config/src/impl_.rs
+++ b/pyo3-build-config/src/impl_.rs
@@ -386,13 +386,7 @@ print("gil_disabled", get_config_var("Py_GIL_DISABLED"))
         };
         let lib_dir = get_key!(sysconfigdata, "LIBDIR").ok().map(str::to_string);
         let gil_disabled = match sysconfigdata.get_value("Py_GIL_DISABLED") {
-            Some(value) => {
-                if value == "1" {
-                    true
-                } else {
-                    false
-                }
-            }
+            Some(value) => value == "1",
             None => false,
         };
         let lib_name = Some(default_lib_name_unix(
diff --git a/pyo3-ffi-check/build.rs b/pyo3-ffi-check/build.rs
index ca4a17b6..0ae7d421 100644
--- a/pyo3-ffi-check/build.rs
+++ b/pyo3-ffi-check/build.rs
@@ -8,12 +8,28 @@ fn main() {
             "import sysconfig; print(sysconfig.get_config_var('INCLUDEPY'), end='');",
         )
         .expect("failed to get lib dir");
+    let gil_disabled_on_windows = dbg!(config
+        .run_python_script(
+            "import sysconfig; import platform; print(sysconfig.get_config_var('Py_GIL_DISABLED') == 1 and platform.system() == 'Windows');",
+        )
+        .expect("failed to get Py_GIL_DISABLED").trim_end()) == "True";
+
+    let clang_args = if gil_disabled_on_windows {
+        vec![
+            format!("-I{python_include_dir}"),
+            "-DPy_GIL_DISABLED".to_string(),
+        ]
+    } else {
+        vec![format!("-I{python_include_dir}")]
+    };
+
+    dbg!(&clang_args);

     println!("cargo:rerun-if-changed=wrapper.h");

     let bindings = bindgen::Builder::default()
         .header("wrapper.h")
-        .clang_arg(format!("-I{python_include_dir}"))
+        .clang_args(clang_args)
         .parse_callbacks(Box::new(bindgen::CargoCallbacks))
         // blocklist some values which apparently have conflicting definitions on unix
         .blocklist_item("FP_NORMAL")