diff --git a/CMakeLists.txt b/CMakeLists.txt
index b4e274c..cadf7ad 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,8 @@
 cmake_minimum_required(VERSION 3.15)
 
-# Set the toolchain file for vcpkg on Windows.
-if(WIN32)
+# Set the toolchain file for vcpkg on Windows (only if VCPKG_ROOT is set;
+# on mingw we get libusb from pkg-config directly).
+if(WIN32 AND NOT "$ENV{VCPKG_ROOT}" STREQUAL "")
     set(CMAKE_TOOLCHAIN_FILE "$ENV{VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake")
 endif()
 
diff --git a/txdemo/stream_duplex_demo/main.cpp b/txdemo/stream_duplex_demo/main.cpp
index 400cfe1..d7ff0e2 100644
--- a/txdemo/stream_duplex_demo/main.cpp
+++ b/txdemo/stream_duplex_demo/main.cpp
@@ -41,6 +41,12 @@
   #include <windows.h>
   typedef int pid_t;
   #define sleep(seconds) Sleep((seconds)*1000)
+#elif defined(__MINGW32__) || defined(__MINGW64__)
+  // mingw builds: POSIX libusb/unistd PLUS io.h/fcntl.h for binary stdin.
+  #include <io.h>
+  #include <fcntl.h>
+  #include <unistd.h>
+  #include <libusb-1.0/libusb.h>
 #elif defined(__ANDROID__)
   #include <libusb.h>
   #include <unistd.h>
@@ -233,7 +239,9 @@ int main(int argc, char **argv) {
     }
   }
 
-#if defined(_MSC_VER)
+#if defined(_WIN32)
+  // mingw/GCC defines _WIN32 but not _MSC_VER, yet still has _setmode — make
+  // stdin binary so a 0x1A/CRLF doesn't corrupt the length-prefixed PSDU stream.
   _setmode(_fileno(stdin), _O_BINARY);
 #endif
 
diff --git a/txdemo/stream_tx_demo/main.cpp b/txdemo/stream_tx_demo/main.cpp
index 7dc1279..c67d485 100644
--- a/txdemo/stream_tx_demo/main.cpp
+++ b/txdemo/stream_tx_demo/main.cpp
@@ -46,6 +46,12 @@
   #include <process.h>
   typedef int pid_t;
   #define sleep(seconds) Sleep((seconds)*1000)
+#elif defined(__MINGW32__) || defined(__MINGW64__)
+  // mingw builds: POSIX libusb/unistd PLUS io.h/fcntl.h for binary stdin.
+  #include <io.h>
+  #include <fcntl.h>
+  #include <unistd.h>
+  #include <libusb-1.0/libusb.h>
 #elif defined(__ANDROID__)
   #include <libusb.h>
   #include <unistd.h>
@@ -134,8 +140,9 @@ int main(int argc, char **argv) {
     }
   }
 
-#if defined(_MSC_VER)
+#if defined(_WIN32)
   // Make stdin binary so a 0x1A or CRLF doesn't corrupt PSDU bytes.
+  // (mingw/GCC defines _WIN32 but not _MSC_VER, yet still has _setmode.)
   _setmode(_fileno(stdin), _O_BINARY);
 #endif