diff --git a/contrib/libcxx-mingw-w64-aarch64 b/contrib/libcxx-mingw-w64-aarch64
new file mode 120000
index 00000000000..3217560f7be
--- /dev/null
+++ b/contrib/libcxx-mingw-w64-aarch64
@@ -0,0 +1 @@
+libcxx-mingw-w64
\ No newline at end of file
diff --git a/contrib/libcxx-mingw-w64-armv7 b/contrib/libcxx-mingw-w64-armv7
new file mode 120000
index 00000000000..3217560f7be
--- /dev/null
+++ b/contrib/libcxx-mingw-w64-armv7
@@ -0,0 +1 @@
+libcxx-mingw-w64
\ No newline at end of file
diff --git a/contrib/libcxx-mingw-w64-i686 b/contrib/libcxx-mingw-w64-i686
new file mode 120000
index 00000000000..3217560f7be
--- /dev/null
+++ b/contrib/libcxx-mingw-w64-i686
@@ -0,0 +1 @@
+libcxx-mingw-w64
\ No newline at end of file
diff --git a/contrib/libcxx-mingw-w64-x86_64 b/contrib/libcxx-mingw-w64-x86_64
new file mode 120000
index 00000000000..3217560f7be
--- /dev/null
+++ b/contrib/libcxx-mingw-w64-x86_64
@@ -0,0 +1 @@
+libcxx-mingw-w64
\ No newline at end of file
diff --git a/contrib/libcxx-mingw-w64/template.py b/contrib/libcxx-mingw-w64/template.py
new file mode 100644
index 00000000000..2b49cf1ca42
--- /dev/null
+++ b/contrib/libcxx-mingw-w64/template.py
@@ -0,0 +1,170 @@
+pkgname = "libcxx-mingw-w64"
+pkgver = "18.1.8"
+pkgrel = 0
+build_style = "cmake"
+configure_args = [
+    "-DCMAKE_SYSTEM_NAME=Windows",
+    "-DCMAKE_BUILD_TYPE=Release",
+    "-Wno-dev",
+    "-DCMAKE_C_COMPILER=/usr/bin/clang",
+    "-DCMAKE_CXX_COMPILER=/usr/bin/clang++",
+    "-DCMAKE_AR=/usr/bin/llvm-ar",
+    "-DCMAKE_NM=/usr/bin/llvm-nm",
+    "-DCMAKE_RANLIB=/usr/bin/llvm-ranlib",
+    # prevent failing checks
+    "-DCMAKE_C_COMPILER_WORKS=ON",
+    "-DCMAKE_CXX_COMPILER_WORKS=ON",
+    "-DCMAKE_ASM_COMPILER_WORKS=ON",
+    # build these runtimes
+    "-DLLVM_ENABLE_RUNTIMES=libcxx;libcxxabi;libunwind",
+    # don't use libgcc
+    "-DLIBUNWIND_USE_COMPILER_RT=ON",
+    "-DLIBCXX_USE_COMPILER_RT=ON",
+    "-DLIBCXXABI_USE_COMPILER_RT=ON",
+    # building libunwind DSO with runtime dependency on c++ abi library is not supported
+    "-DLIBUNWIND_ENABLE_SHARED=OFF",
+    # FIXME: lld can't find -lc++ or -lunwind for some reason??
+    "-DLIBCXX_ENABLE_SHARED=OFF",
+    "-DLIBCXXABI_ENABLE_SHARED=OFF",
+]
+cmake_dir = "runtimes"
+hostmakedepends = ["cmake", "python"]
+depends = [f"libcxxabi-mingw-w64={pkgver}-r{pkgrel}"]
+pkgdesc = "LLVM libc++ for Windows development"
+maintainer = "Erica Z <zerica@callcc.eu>"
+license = "Apache-2.0"
+url = "https://llvm.org"
+source = f"https://github.com/llvm/llvm-project/releases/download/llvmorg-{pkgver}/llvm-project-{pkgver}.src.tar.xz"
+sha256 = "0b58557a6d32ceee97c8d533a59b9212d87e0fc4d2833924eb6c611247db2f2a"
+# crosstoolchain
+options = ["!cross", "!check", "!lto", "empty"]
+
+_targets = ["x86_64", "i686", "aarch64", "armv7"]
+
+for _an in _targets:
+    # hostmakedepends += [f"mingw-w64-headers-{_an}", f"mingw-w64-crt-{_an}"]
+    hostmakedepends += [f"mingw-w64-headers-{_an}"]
+    pass
+
+
+def do_configure(self):
+    from cbuild.util import cmake
+
+    for an in _targets:
+        at = an + "-w64-mingw32"
+        # configure libcxx
+        with self.stamp(f"{an}_configure") as s:
+            s.check()
+            cmake.configure(
+                self,
+                f"build-{an}",
+                self.cmake_dir,
+                [
+                    *self.configure_args,
+                    f"-DCMAKE_SYSROOT=/usr/{at}",
+                    f"-DCMAKE_INSTALL_PREFIX=/usr/{at}",
+                    f"-DCMAKE_ASM_COMPILER_TARGET={at}",
+                    f"-DCMAKE_CXX_COMPILER_TARGET={at}",
+                    f"-DCMAKE_C_COMPILER_TARGET={at}",
+                ],
+                cross_build=False,
+                generator="Unix Makefiles",
+                env={
+                    "CFLAGS": "",
+                    "CXXFLAGS": "",
+                    "LDFLAGS": "",
+                },
+            )
+
+
+def do_build(self):
+    from cbuild.util import cmake
+
+    for an in _targets:
+        with self.stamp(f"{an}_build") as s:
+            s.check()
+            cmake.build(self, f"build-{an}", ["--verbose"])
+
+
+def do_install(self):
+    from cbuild.util import cmake
+
+    for an in _targets:
+        cmake.install(
+            self,
+            f"build-{an}",
+        )
+
+
+def _gen(an, at):
+    @subpackage(f"libunwind-mingw-w64-{an}")
+    def _unw(self):
+        self.pkgdesc = "LLVM libunwind for Windows development"
+        self.subdesc = an
+        self.depends = []  # TODO: determine this
+        # not supported for COFF
+        self.nostrip_files = [
+            f"usr/{at}/lib/libunwind.a",
+        ]
+
+        return [
+            f"usr/{at}/lib/libunwind.*",
+            f"usr/{at}/include/*unwind*",
+            f"usr/{at}/include/mach-o",
+        ]
+
+    @subpackage(f"libcxxabi-mingw-w64-{an}")
+    def _abi(self):
+        self.pkgdesc = "LLVM libc++abi for Windows development"
+        self.subdesc = an
+        self.depends = [f"libunwind-mingw-w64-{an}={pkgver}-r{pkgrel}"]
+        # not supported for COFF
+        self.nostrip_files = [
+            f"usr/{at}/lib/libc++abi.a",
+        ]
+
+        return [
+            f"usr/{at}/lib/libc++abi*",
+            f"usr/{at}/include/c++/v1/*cxxabi*.h",
+        ]
+
+    @subpackage(f"libcxx-mingw-w64-{an}")
+    def _subp(self):
+        self.subdesc = an
+        self.depends = [f"libcxxabi-mingw-w64-{an}={pkgver}-r{pkgrel}"]
+        # not supported for COFF
+        self.nostrip_files = [
+            f"usr/{at}/lib/libc++.a",
+            f"usr/{at}/lib/libc++experimental.a",
+        ]
+
+        return [f"usr/{at}"]
+
+    depends.append(f"libcxx-mingw-w64-{an}={pkgver}-r{pkgrel}")
+
+
+for _an in _targets:
+    _at = _an + "-w64-mingw32"
+    _gen(_an, _at)
+
+
+@subpackage("libunwind-mingw-w64")
+def _unw(self):
+    self.pkgdesc = "LLVM libunwind for Windows development"
+    self.depends = []  # TODO: determine this
+    self.options = ["empty"]
+    for an in _targets:
+        self.depends.append(f"libunwind-mingw-w64-{an}={pkgver}-r{pkgrel}")
+
+    return []
+
+
+@subpackage("libcxxabi-mingw-w64")
+def _abi(self):
+    self.pkgdesc = "LLVM libc++abi for Windows development"
+    self.depends = [f"libunwind-mingw-w64={pkgver}-r{pkgrel}"]
+    self.options = ["empty"]
+    for an in _targets:
+        self.depends.append(f"libcxxabi-mingw-w64-{an}={pkgver}-r{pkgrel}")
+
+    return []
diff --git a/contrib/libcxx-mingw-w64/update.py b/contrib/libcxx-mingw-w64/update.py
new file mode 100644
index 00000000000..faff136d0af
--- /dev/null
+++ b/contrib/libcxx-mingw-w64/update.py
@@ -0,0 +1 @@
+pkgname = "llvmorg"
diff --git a/contrib/libcxxabi-mingw-w64 b/contrib/libcxxabi-mingw-w64
new file mode 120000
index 00000000000..3217560f7be
--- /dev/null
+++ b/contrib/libcxxabi-mingw-w64
@@ -0,0 +1 @@
+libcxx-mingw-w64
\ No newline at end of file
diff --git a/contrib/libcxxabi-mingw-w64-aarch64 b/contrib/libcxxabi-mingw-w64-aarch64
new file mode 120000
index 00000000000..3217560f7be
--- /dev/null
+++ b/contrib/libcxxabi-mingw-w64-aarch64
@@ -0,0 +1 @@
+libcxx-mingw-w64
\ No newline at end of file
diff --git a/contrib/libcxxabi-mingw-w64-armv7 b/contrib/libcxxabi-mingw-w64-armv7
new file mode 120000
index 00000000000..3217560f7be
--- /dev/null
+++ b/contrib/libcxxabi-mingw-w64-armv7
@@ -0,0 +1 @@
+libcxx-mingw-w64
\ No newline at end of file
diff --git a/contrib/libcxxabi-mingw-w64-i686 b/contrib/libcxxabi-mingw-w64-i686
new file mode 120000
index 00000000000..3217560f7be
--- /dev/null
+++ b/contrib/libcxxabi-mingw-w64-i686
@@ -0,0 +1 @@
+libcxx-mingw-w64
\ No newline at end of file
diff --git a/contrib/libcxxabi-mingw-w64-x86_64 b/contrib/libcxxabi-mingw-w64-x86_64
new file mode 120000
index 00000000000..3217560f7be
--- /dev/null
+++ b/contrib/libcxxabi-mingw-w64-x86_64
@@ -0,0 +1 @@
+libcxx-mingw-w64
\ No newline at end of file
diff --git a/contrib/libunwind-mingw-w64 b/contrib/libunwind-mingw-w64
new file mode 120000
index 00000000000..3217560f7be
--- /dev/null
+++ b/contrib/libunwind-mingw-w64
@@ -0,0 +1 @@
+libcxx-mingw-w64
\ No newline at end of file
diff --git a/contrib/libunwind-mingw-w64-aarch64 b/contrib/libunwind-mingw-w64-aarch64
new file mode 120000
index 00000000000..3217560f7be
--- /dev/null
+++ b/contrib/libunwind-mingw-w64-aarch64
@@ -0,0 +1 @@
+libcxx-mingw-w64
\ No newline at end of file
diff --git a/contrib/libunwind-mingw-w64-armv7 b/contrib/libunwind-mingw-w64-armv7
new file mode 120000
index 00000000000..3217560f7be
--- /dev/null
+++ b/contrib/libunwind-mingw-w64-armv7
@@ -0,0 +1 @@
+libcxx-mingw-w64
\ No newline at end of file
diff --git a/contrib/libunwind-mingw-w64-i686 b/contrib/libunwind-mingw-w64-i686
new file mode 120000
index 00000000000..3217560f7be
--- /dev/null
+++ b/contrib/libunwind-mingw-w64-i686
@@ -0,0 +1 @@
+libcxx-mingw-w64
\ No newline at end of file
diff --git a/contrib/libunwind-mingw-w64-x86_64 b/contrib/libunwind-mingw-w64-x86_64
new file mode 120000
index 00000000000..3217560f7be
--- /dev/null
+++ b/contrib/libunwind-mingw-w64-x86_64
@@ -0,0 +1 @@
+libcxx-mingw-w64
\ No newline at end of file