diff --git a/gdal-src/build.rs b/gdal-src/build.rs
index b123a397..d449958d 100644
--- a/gdal-src/build.rs
+++ b/gdal-src/build.rs
@@ -1,3 +1,5 @@
+use std::path;
+
 macro_rules! handle_ogr_driver {
     ($config: ident, $driver: literal) => {
         if cfg!(feature = $driver) {
@@ -81,7 +83,11 @@ fn main() {
         .define("BUILD_GMOCK", "OFF")
         .define(
             "PROJ_INCLUDE_DIR",
-            format!("{}/include", proj_root.display()),
+            format!(
+                "{}{}include",
+                proj_root.display(),
+                std::path::MAIN_SEPARATOR
+            ),
         )
         .define("PROJ_LIBRARY", proj_library)
         .define("ACCEPT_MISSING_LINUX_FS_HEADER", "ON");
@@ -198,7 +204,10 @@ fn main() {
         config
             .define("GDAL_USE_SQLITE3", "ON")
             .define("SQLite3_INCLUDE_DIR", sqlite3_include_dir)
-            .define("SQLite3_LIBRARY", format!("{sqlite3_lib_dir}/libsqlite3.a"))
+            .define(
+                "SQLite3_LIBRARY",
+                format!("{sqlite3_lib_dir}{}libsqlite3.a", std::path::MAIN_SEPARATOR),
+            )
             .define("OGR_ENABLE_DRIVER_SQLITE", "ON");
     } else {
         config.define("GDAL_USE_SQLITE3", "OFF");
@@ -217,8 +226,17 @@ fn main() {
         println!("cargo:rustc-link-lib=static={hdf5_lib}");
         config
             .define("GDAL_USE_HDF5", "ON")
-            .define("HDF5_C_COMPILER_EXECUTABLE", format!("{hdf5_dir}/bin/h5cc"))
-            .define("HDF5_C_INCLUDE_DIR", format!("{hdf5_dir}/include"))
+            .define(
+                "HDF5_C_COMPILER_EXECUTABLE",
+                format!(
+                    "{hdf5_dir}{sep}bin{sep}h5cc",
+                    sep = std::path::MAIN_SEPARATOR
+                ),
+            )
+            .define(
+                "HDF5_C_INCLUDE_DIR",
+                format!("{hdf5_dir}{}include", std::path::MAIN_SEPARATOR),
+            )
             .define("HDF5_hdf5_LIBRARY_DEBUG", &hdf5_lib_dir)
             .define("HDF5_hdf5_LIBRARY_RELEASE", &hdf5_lib_dir)
             .define("GDAL_ENABLE_DRIVER_HDF5", "ON")
@@ -251,7 +269,10 @@ fn main() {
         println!("cargo:rustc-link-lib=static={hl_library}");
         config
             .define("GDAL_USE_NETCDF", "ON")
-            .define("NETCDF_INCLUDE_DIR", format!("{netcdf_root_dir}/include"))
+            .define(
+                "NETCDF_INCLUDE_DIR",
+                format!("{netcdf_root_dir}{}include", std::path::MAIN_SEPARATOR),
+            )
             .define("NETCDF_LIBRARY", netcdf_lib)
             .define("GDAL_ENABLE_DRIVER_NETCDF", "ON");
     } else {
@@ -262,11 +283,23 @@ fn main() {
         let curl_root = std::env::var("DEP_CURL_ROOT").expect("set from curl-sys");
         config
             .define("GDAL_USE_CURL", "ON")
-            .define("CURL_INCLUDE_DIR", format!("{curl_root}/include"))
-            .define("CURL_LIBRARY_DEBUG", format!("{curl_root}/build/libcurl.a"))
+            .define(
+                "CURL_INCLUDE_DIR",
+                format!("{curl_root}{}include", std::path::MAIN_SEPARATOR),
+            )
+            .define(
+                "CURL_LIBRARY_DEBUG",
+                format!(
+                    "{curl_root}{sep}build{sep}libcurl.a",
+                    sep = std::path::MAIN_SEPARATOR
+                ),
+            )
             .define(
                 "CURL_LIBRARY_RELEASE",
-                format!("{curl_root}/build/libcurl.a"),
+                format!(
+                    "{curl_root}{sep}build{sep}libcurl.a",
+                    sep = std::path::MAIN_SEPARATOR
+                ),
             )
             .define("CURL_USE_STATIC_LIBS", "ON");
     } else {
@@ -318,7 +351,10 @@ fn main() {
 
     if cfg!(feature = "geos_static") {
         let geos_root = std::env::var("DEP_GEOSSRC_ROOT").expect("this is set by geos-src");
-        config.define("GEOS_INCLUDE_DIR", format!("{geos_root}/include"));
+        config.define(
+            "GEOS_INCLUDE_DIR",
+            format!("{geos_root}{}include", std::path::MAIN_SEPARATOR),
+        );
         let lib_path = find_library("geos", geos_root);
         config.define("GEOS_LIBRARY", lib_path);
     }
@@ -348,7 +384,7 @@ fn main() {
         "cargo:rustc-link-search=native={}",
         lib_dir.to_str().unwrap()
     );
-    let lib_dir = res.join("build/lib");
+    let lib_dir = res.join("build").join("lib");
     println!(
         "cargo:rustc-link-search=native={}",
         lib_dir.to_str().unwrap()