diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 65e3a6d1..29deb8a0 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -14,18 +14,9 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - { os: macOS-13, stack: lts-12.26, stack-extra-deps: "bytestring-0.11.3.0, filepath-1.4.100.0, unix-2.8.0.0" }
-          - { os: macos-latest, stack: lts-22.7, stack-extra-deps: "bytestring-0.11.5.3, filepath-1.5.2.0, os-string-2.0.2, unix-2.8.5.1", stack-package-flags: "{directory: {os-string: true}, unix: {os-string: true}}", ghc-flags: -Werror=deprecations }
-          - { os: ubuntu-latest, ghc: 8.4.4, cabal: 3.0.0.0, overrides: "before_prepare() { sed -i.bak /utimensat/d configure.ac; }" }
-          - { os: ubuntu-latest, ghc: 8.6.5, cabal: 3.0.0.0, overrides: "before_prepare() { sed -i.bak /utimensat/d configure.ac; }" }
-          - { os: ubuntu-latest, ghc: 8.10.7, cabal: 3.8.1.0 }
-          - { os: ubuntu-latest, ghc: 9.0.2, cabal: 3.8.1.0 }
-          - { os: ubuntu-latest, ghc: 9.2.4, cabal: 3.8.1.0 }
-          - { os: ubuntu-latest, ghc: 9.4.3, cabal: 3.8.1.0 }
-          - { os: ubuntu-latest, ghc: latest, cabal: latest, cabal-package-flags: +os-string, ghc-flags: -Werror=deprecations }
           - { os: windows-latest, stack: lts-12.26, stack-extra-deps: "bytestring-0.11.3.0, filepath-1.4.100.0, time-1.8.0.2, Win32-2.13.3.0", overrides: "before_prepare() { sed -i.bak -e /CreateSymbolicLinkW/d -e /GetFinalPathNameByHandleW/d configure.ac; }" }
+          - { os: windows-latest, stack: lts-17.5, stack-extra-deps: "bytestring-0.11.3.0, filepath-1.4.100.0, time-1.9.3, Win32-2.13.3.0", overrides: "before_prepare() { sed -i.bak -e /CreateSymbolicLinkW/d -e /GetFinalPathNameByHandleW/d configure.ac; }" }
           - { os: windows-latest, stack: lts-17.5, stack-extra-deps: "bytestring-0.11.3.0, filepath-1.4.100.0, time-1.9.3, Win32-2.13.3.0" }
-          - { os: windows-latest, stack: lts-22.7, stack-extra-deps: "bytestring-0.11.5.3, filepath-1.5.2.0, os-string-2.0.2, time-1.14, Win32-2.14.0.0", stack-package-flags: "{directory: {os-string: true}, Win32: {os-string: true}}", ghc-flags: -Werror=deprecations }
     runs-on: ${{ matrix.os }}
     env:
       CABAL_PACKAGE_FLAGS: ${{ matrix.cabal-package-flags }}
diff --git a/main.c b/main.c
new file mode 100644
index 00000000..464e7b31
--- /dev/null
+++ b/main.c
@@ -0,0 +1,39 @@
+#include <windows.h>
+#include <stdio.h>
+
+const wchar_t *error_string(DWORD code)
+{
+    static wchar_t message[1024];
+    if (!FormatMessageW(
+            FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
+            NULL, code, 0, message, sizeof(message) / sizeof(*message), NULL)) {
+        wprintf(L"??? %d\n", GetLastError());
+        return L"???";
+    }
+    return message;
+}
+
+static const wchar_t *dir = L"VERYLONGDIRECTORYNAME";
+
+int main(void)
+{
+    wchar_t buf[512], buf2[512];
+    if (!CreateDirectoryW(dir, NULL)) {
+        DWORD code = GetLastError();
+        if (code != ERROR_ALREADY_EXISTS) {
+            wprintf(L"CreateDirectoryA: %ls\n", error_string(code));
+            return 1;
+        }
+    }
+    if (!GetShortPathNameW(dir, buf, sizeof(buf) / sizeof(*buf))) {
+        wprintf(L"GetShortPathNameW: %ls\n", error_string(GetLastError()));
+        return 1;
+    }
+    wprintf(L"short path = %ls\n", buf);
+    if (!GetLongPathNameW(buf, buf2, sizeof(buf2) / sizeof(*buf2))) {
+        wprintf(L"GetLongPathNameW: %ls\n", error_string(GetLastError()));
+        return 1;
+    }
+    wprintf(L"short-then-long path = %ls\n", buf2);
+    return 0;
+}
diff --git a/tools/testscript b/tools/testscript
index 194d9660..636f391b 100755
--- a/tools/testscript
+++ b/tools/testscript
@@ -12,6 +12,15 @@ before_prepare() {
 
 prepare() {
     before_prepare
+
+    (
+        ls /usr/bin/x86_64*
+        CC=x86_64-w64-mingw32-gcc
+        $CC -dumpmachine
+        $CC -Wall main.c
+        ./a.exe
+    )
+
     if [ -f configure.ac ]; then
         autoreconf -i
     fi