diff --git a/README.md b/README.md
index f4c0752..60678ab 100644
--- a/README.md
+++ b/README.md
@@ -85,6 +85,34 @@ cmake ..
 make
 ```
 
+### Building on Windows
+
+While most of RADAE is in Python, there is a `lpcnet_demo` application
+that is required to be compiled. To do this for Windows, you can run
+something like the following from a Linux machine:
+
+```
+wget https://github.com/mstorsjo/llvm-mingw/releases/download/20240619/llvm-mingw-20240619-ucrt-ubuntu-20.04-x86_64.tar.xz
+tar xzf llvm-mingw-20240619-ucrt-ubuntu-20.04-x86_64.tar.xz
+export PATH=`pwd`/llvm-mingw-20240619-ucrt-ubuntu-20.04-x86_64/bin:$PATH
+export RADAE_PATH=`pwd`/radae
+cd $RADAE_PATH
+mkdir build_windows
+cd build_windows
+cmake -DCMAKE_TOOLCHAIN_FILE=$RADAE_PATH/cross-compile/mingw-llvm-x86_64.cmake ..
+make
+```
+
+(Replace `x86_64` in `mingw-llvm-x86_64.cmake` with either `i686` or `aarch64` for 32-bit x86 or 64-bit ARM, respectively.)
+
+Once done, `lpcnet_demo.exe` will be inside the `src` folder inside `build_windows`.
+
+#### Limitations
+
+* ctests are untested and likely do not work without additional changes.
+* Visual Studio is not supported, only MinGW.
+* Generating a Windows installer is currently not supported. `lpcnet_demo.exe` is intended to be included with other applications built with MinGW (such as freedv-gui).
+
 # Automated Tests
 
 The `cmake/ctest` framework is being used as a build and test framework. The command lines in `CmakeLists.txt` are a good source of examples, if you are interested in running the code in this repo. The ctests are a work in progress and may not pass on all systems (see Scope above).
diff --git a/cmake/BuildOpus.cmake b/cmake/BuildOpus.cmake
index 24667b3..91f1b9b 100644
--- a/cmake/BuildOpus.cmake
+++ b/cmake/BuildOpus.cmake
@@ -1,11 +1,19 @@
 message(STATUS "Will build opus with FARGAN")
 
+set(CONFIGURE_COMMAND ./autogen.sh && ./configure --enable-dred --disable-shared)
+
+if (CMAKE_CROSSCOMPILING)
+set(CONFIGURE_COMMAND ${CONFIGURE_COMMAND} --host=${CMAKE_C_COMPILER_TARGET} --target=${CMAKE_C_COMPILER_TARGET})
+endif (CMAKE_CROSSCOMPILING)
+
+message(STATUS "${CONFIGURE_COMMAND}")
+
 include(ExternalProject)
 ExternalProject_Add(build_opus
     URL https://gitlab.xiph.org/xiph/opus/-/archive/main/opus-main.tar.gz
     DOWNLOAD_EXTRACT_TIMESTAMP NO
     BUILD_IN_SOURCE 1
-    CONFIGURE_COMMAND ./autogen.sh && ./configure --enable-dred --disable-shared
+    CONFIGURE_COMMAND ${CONFIGURE_COMMAND}
     BUILD_COMMAND $(MAKE)
     INSTALL_COMMAND ""
 )
@@ -17,7 +25,7 @@ add_dependencies(opus build_opus)
 
 set_target_properties(opus PROPERTIES
     IMPORTED_LOCATION "${BINARY_DIR}/.libs/libopus${CMAKE_STATIC_LIBRARY_SUFFIX}"
-    IMPORTED_IMPLIB   "${BINARY_DIR}/.libs/libopus${CMAKE_IMPORT_LIBRARY_SUFFIX}"
+    IMPORTED_IMPLIB   "${BINARY_DIR}/.libs/libopus${CMAKE_STATIC_LIBRARY_SUFFIX}"
 )
 
 include_directories(${SOURCE_DIR}/dnn ${SOURCE_DIR}/celt ${SOURCE_DIR}/include)
diff --git a/cross-compile/mingw-llvm-aarch64.cmake b/cross-compile/mingw-llvm-aarch64.cmake
new file mode 100644
index 0000000..2e7ab0e
--- /dev/null
+++ b/cross-compile/mingw-llvm-aarch64.cmake
@@ -0,0 +1,26 @@
+set(CMAKE_SYSTEM_NAME Windows)
+set(CMAKE_SYSTEM_PROCESSOR aarch64)
+
+set(triple ${CMAKE_SYSTEM_PROCESSOR}-w64-mingw32)
+
+set(CMAKE_C_COMPILER ${triple}-clang)
+set(CMAKE_C_COMPILER_TARGET ${triple})
+set(CMAKE_CXX_COMPILER ${triple}-clang++)
+set(CMAKE_CXX_COMPILER_TARGET ${triple})
+set(CMAKE_AR ${triple}-ar)
+set(CMAKE_RANLIB ${triple}-ranlib)
+set(CMAKE_RC_COMPILER ${triple}-windres)
+
+set(CMAKE_C_FLAGS "-Wno-unused-command-line-argument -gcodeview")
+set(CMAKE_CXX_FLAGS "-Wno-unused-command-line-argument -gcodeview")
+set(CMAKE_EXE_LINKER_FLAGS -Wl,--pdb=)
+
+# For make package use.
+set(CMAKE_OBJDUMP ${triple}-objdump)
+set(FREEDV_USING_LLVM_MINGW 1)
+
+# adjust the default behaviour of the FIND_XXX() commands:
+# search headers and libraries in the target environment, search 
+# programs in the host environment
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
diff --git a/cross-compile/mingw-llvm-i686.cmake b/cross-compile/mingw-llvm-i686.cmake
new file mode 100644
index 0000000..c73338c
--- /dev/null
+++ b/cross-compile/mingw-llvm-i686.cmake
@@ -0,0 +1,28 @@
+set(CMAKE_SYSTEM_NAME Windows)
+set(CMAKE_SYSTEM_PROCESSOR i686)
+
+set(triple ${CMAKE_SYSTEM_PROCESSOR}-w64-mingw32)
+
+set(CMAKE_C_COMPILER ${triple}-clang)
+set(CMAKE_C_COMPILER_TARGET ${triple})
+set(CMAKE_CXX_COMPILER ${triple}-clang++)
+set(CMAKE_CXX_COMPILER_TARGET ${triple})
+
+set(CMAKE_AR ${triple}-ar)
+set(CMAKE_RANLIB ${triple}-ranlib)
+set(CMAKE_RC_COMPILER ${triple}-windres)
+
+set(CMAKE_C_FLAGS "-Wno-unused-command-line-argument -gcodeview")
+set(CMAKE_CXX_FLAGS "-Wno-unused-command-line-argument -gcodeview")
+set(CMAKE_EXE_LINKER_FLAGS -Wl,--pdb=)
+
+# For make package use.
+set(CMAKE_OBJDUMP ${triple}-objdump)
+set(FREEDV_USING_LLVM_MINGW 1)
+
+# adjust the default behaviour of the FIND_XXX() commands:
+# search headers and libraries in the target environment, search 
+# programs in the host environment
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
diff --git a/cross-compile/mingw-llvm-x86_64.cmake b/cross-compile/mingw-llvm-x86_64.cmake
new file mode 100644
index 0000000..9161463
--- /dev/null
+++ b/cross-compile/mingw-llvm-x86_64.cmake
@@ -0,0 +1,28 @@
+set(CMAKE_SYSTEM_NAME Windows)
+set(CMAKE_SYSTEM_PROCESSOR x86_64)
+
+set(triple ${CMAKE_SYSTEM_PROCESSOR}-w64-mingw32)
+
+set(CMAKE_C_COMPILER ${triple}-clang)
+set(CMAKE_C_COMPILER_TARGET ${triple})
+set(CMAKE_CXX_COMPILER ${triple}-clang++)
+set(CMAKE_CXX_COMPILER_TARGET ${triple})
+
+set(CMAKE_AR ${triple}-ar)
+set(CMAKE_RANLIB ${triple}-ranlib)
+set(CMAKE_RC_COMPILER ${triple}-windres)
+
+set(CMAKE_C_FLAGS "-Wno-unused-command-line-argument -gcodeview")
+set(CMAKE_CXX_FLAGS "-Wno-unused-command-line-argument -gcodeview")
+set(CMAKE_EXE_LINKER_FLAGS -Wl,--pdb=)
+
+# For make package use.
+set(CMAKE_OBJDUMP ${triple}-objdump)
+set(FREEDV_USING_LLVM_MINGW 1)
+
+# adjust the default behaviour of the FIND_XXX() commands:
+# search headers and libraries in the target environment, search 
+# programs in the host environment
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
diff --git a/src/lpcnet_demo.c b/src/lpcnet_demo.c
index d110715..4ce3d94 100644
--- a/src/lpcnet_demo.c
+++ b/src/lpcnet_demo.c
@@ -39,6 +39,12 @@
 #include "fargan.h"
 #include "cpu_support.h"
 
+#ifdef _WIN32
+// For _setmode().
+#include <io.h>
+#include <fcntl.h>
+#endif // _WIN32
+
 #ifdef USE_WEIGHTS_FILE
 # if __unix__
 #  include <fcntl.h>
@@ -120,7 +126,14 @@ int main(int argc, char **argv) {
     if (argc != 4) usage();
 
     if (strcmp(argv[2], "-") == 0)
+    {
+#ifdef _WIN32
+        // Note: freopen() returns NULL if filename is NULL, so
+        // we have to use setmode() to make it a binary stream instead.
+        _setmode(_fileno(stdin), O_BINARY);
+#endif // _WIN32
         fin = stdin;
+    }
     else
         fin = fopen(argv[2], "rb");
     if (fin == NULL) {
@@ -129,7 +142,14 @@ int main(int argc, char **argv) {
     }
 
     if (strcmp(argv[3], "-") == 0)
+    {
+#ifdef _WIN32
+        // Note: freopen() returns NULL if filename is NULL, so
+        // we have to use setmode() to make it a binary stream instead.
+        _setmode(_fileno(stdout), O_BINARY);
+#endif // _WIN32
         fout = stdout;
+    }
     else 
         fout = fopen(argv[3], "wb");
     if (fout == NULL) {