diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f315e35..3874cb8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -59,6 +59,13 @@ jobs:
           echo "C:\Program Files\PostgreSQL\12\bin" >> $GITHUB_PATH
           echo "C:\Program Files\PostgreSQL\12\lib" >> $GITHUB_PATH
           echo "PQ_LIB_DIR=C:\Program Files\PostgreSQL\12\lib" >> $GITHUB_ENV
+
+      - name: Windows setup (bundled)
+        if: runner.os == 'Windows' && matrix.features == 'bundled'
+        shell: bash
+        run: |
+          echo "OPENSSL_RUST_USE_NASM=0" >> $GITHUB_ENV
+          echo OPENSSL_SRC_PERL=C:/Strawberry/perl/bin/perl >> $GITHUB_ENV
       - name: Install rust toolchain
         uses: dtolnay/rust-toolchain@stable
 
@@ -70,6 +77,7 @@ jobs:
         shell: bash
         run: |
           cargo test --no-default-features --features "${{ matrix.features }}"
+
       - name: Test compile diesel
         shell: bash
         run: |
diff --git a/pq-src/additional_include/pg_config.h b/pq-src/additional_include/pg_config.h
index 07c1bcb..cbd5c55 100644
--- a/pq-src/additional_include/pg_config.h
+++ b/pq-src/additional_include/pg_config.h
@@ -68,15 +68,22 @@
 /* Define to 1 if you have the <stdlib.h> header file. */
 #define HAVE_STDLIB_H 1
 
+// that function does not exist on macos
+#ifndef __APPLE__
 /* Define to 1 if you have the `strchrnul' function. */
 #define HAVE_STRCHRNUL 1
+#endif
 
 /* Define to 1 if you have the `strerror_r' function. */
 #define HAVE_STRERROR_R 1
 
+// windows does not have that header
+#ifndef _WIN32
 /* Define to 1 if you have the <strings.h> header file. */
 #define HAVE_STRINGS_H 1
 
+#endif
+
 /* Define to 1 if you have the <string.h> header file. */
 #define HAVE_STRING_H 1
 
@@ -126,8 +133,10 @@
 /* Define to the version of this package. */
 #define PACKAGE_VERSION "16.0"
 
+#ifndef _WIN32
 /* Define to the name of a signed 128-bit integer type. */
 #define PG_INT128_TYPE __int128
+#endif
 
 /* Define to the name of a signed 64-bit integer type. */
 #define PG_INT64_TYPE long int
@@ -250,3 +259,7 @@
 
 /* Define to the appropriate printf length modifier for 64-bit ints. */
 #define INT64_MODIFIER "l"
+
+#if defined _WIN32
+#define HAVE_INET_ATON 1
+#endif
diff --git a/pq-src/build.rs b/pq-src/build.rs
index 9e49ee8..53b41f8 100644
--- a/pq-src/build.rs
+++ b/pq-src/build.rs
@@ -1,6 +1,7 @@
 use std::path::PathBuf;
 
 const LIBPORTS: &'static [&'static str] = &[
+    #[cfg(target_os = "linux")]
     "getpeereid.c",
     "strlcat.c",
     "strlcpy.c",
@@ -8,11 +9,15 @@ const LIBPORTS: &'static [&'static str] = &[
     "pg_crc32c_sb8.c",
     "bsearch_arg.c",
     "chklocale.c",
+    #[cfg(not(target_os = "windows"))]
     "inet_net_ntop.c",
     "noblock.c",
     "pg_bitutils.c",
+    #[cfg(not(target_os = "windows"))]
     "pg_strong_random.c",
+    #[cfg(not(target_os = "windows"))]
     "pgcheckdir.c",
+    #[cfg(not(target_os = "windows"))]
     "pgmkdirp.c",
     "pgsleep.c",
     "pgstrcasecmp.c",
@@ -22,14 +27,19 @@ const LIBPORTS: &'static [&'static str] = &[
     "quotes.c",
     "strerror.c",
     "tar.c",
+    #[cfg(not(target_os = "windows"))]
     "thread.c",
+    #[cfg(target_os = "macos")]
+    "explicit_bzero.c",
 ];
 
 const LIBCOMMON: &'static [&'static str] = &[
     "file_perm.c",
+    #[cfg(not(target_os = "windows"))]
     "encnames.c",
     "base64.c",
     "scram-common.c",
+    #[cfg(not(target_os = "windows"))]
     "ip.c",
     "jsonapi.c",
     "kwlookup.c",
@@ -39,14 +49,18 @@ const LIBCOMMON: &'static [&'static str] = &[
     "pg_get_line.c",
     "pg_lzcompress.c",
     "pg_prng.c",
+    #[cfg(not(target_os = "windows"))]
     "pgfnames.c",
     "psprintf.c",
+    #[cfg(not(target_os = "windows"))]
     "rmtree.c",
     "saslprep.c",
     "string.c",
     "stringinfo.c",
     "unicode_norm.c",
+    #[cfg(not(target_os = "windows"))]
     "username.c",
+    #[cfg(not(target_os = "windows"))]
     "wait_error.c",
     "wchar.c",
     "cryptohash_openssl.c",
@@ -129,6 +143,11 @@ fn main() {
     if cfg!(target_os = "linux") {
         basic_build.define("_GNU_SOURCE", None);
     }
+    if cfg!(target_os = "macos") {
+        // something is broken in homebrew
+        // https://github.com/Homebrew/legacy-homebrew/pull/23620
+        basic_build.define("_FORTIFY_SOURCE", Some("0"));
+    }
 
     basic_build
         .clone()