diff --git a/.github/workflows/spec-tests.yml b/.github/workflows/spec-tests.yml
index c13646e..b9bce1b 100644
--- a/.github/workflows/spec-tests.yml
+++ b/.github/workflows/spec-tests.yml
@@ -25,3 +25,27 @@ jobs:
       run: |
         cd test
         ./run-spec-test.py
+
+  build-win:
+    runs-on: windows-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        toolset: [ClangCL, v142]
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: configure
+      run: |
+        mkdir build
+        cd build
+        cmake -T ${{ matrix.toolset }} ..
+    - name: make
+      run: |
+        cmake --build build --config Release
+        cp ./build/Release/wasm3.exe ./build/
+    - name: test
+      run: |
+        cd test
+        python run-spec-test.py
diff --git a/CMakeLists.txt b/CMakeLists.txt
index a3fe79b..f9c9ddf 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -90,6 +90,7 @@ elseif(WIN32)
     set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /Oxs /Oy /GS- /Qvec -Clang -O3")
   endif()
 else()
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Dd_m3HasWASI")
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Wstrict-aliasing -Wno-unused-function -Wno-unused-variable -Wno-unused-parameter -Wno-missing-field-initializers")
   set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -ggdb -O0")
 
diff --git a/platforms/app/main.c b/platforms/app/main.c
index 34a7a20..18744eb 100644
--- a/platforms/app/main.c
+++ b/platforms/app/main.c
@@ -182,8 +182,8 @@ int  main  (int i_argc, const char* i_argv[])
 
     while (argRepl)
     {
-        char cmd_buff[128] = {};
-        const char* argv[32] = {};
+        char cmd_buff[128] = { 0, };
+        const char* argv[32] = { 0, };
         fprintf(stdout, "wasm3> ");
         fflush(stdout);
         if (!fgets(cmd_buff, sizeof(cmd_buff), stdin)) {
diff --git a/source/m3_api_libc.c b/source/m3_api_libc.c
index 07ddd11..22356d4 100644
--- a/source/m3_api_libc.c
+++ b/source/m3_api_libc.c
@@ -13,11 +13,27 @@
 #include "m3_exception.h"
 
 #include <time.h>
-#include <unistd.h>
 #include <errno.h>
 #include <stdio.h>
 
 
+#if defined(WIN32)
+
+#include <Windows.h>
+
+int clock_gettime(int clk_id, struct timespec *spec)
+{
+    __int64 wintime;
+    GetSystemTimeAsFileTime((FILETIME*)&wintime);
+    wintime      -=116444736000000000i64;           //1jan1601 to 1jan1970
+    spec->tv_sec  =wintime / 10000000i64;           //seconds
+    spec->tv_nsec =wintime % 10000000i64 *100;      //nano-seconds
+    return 0;
+}
+
+#endif
+
+
 // TODO: return trap
 void  m3_libc_abort()
 {
diff --git a/source/m3_api_wasi.c b/source/m3_api_wasi.c
index 93d55e0..ebd45fe 100644
--- a/source/m3_api_wasi.c
+++ b/source/m3_api_wasi.c
@@ -12,6 +12,8 @@
 #include "m3_module.h"
 #include "m3_exception.h"
 
+#if defined(d_m3HasWASI)
+
 #include "extra/wasi_core.h"
 
 #include <sys/types.h>
@@ -377,7 +379,6 @@ M3Result SuppressLookupFailure(M3Result i_result)
         return i_result;
 }
 
-
 M3Result  m3_LinkWASI  (IM3Module module)
 {
     M3Result result = c_m3Err_none;
@@ -410,4 +411,12 @@ _catch:
     return result;
 }
 
+#else  // d_m3HasWASI
+
+M3Result  m3_LinkWASI  (IM3Module module)
+{
+    return c_m3Err_none;
+}
+
+#endif // d_m3HasWASI
 
diff --git a/source/m3_env.h b/source/m3_env.h
index 069893c..19626c2 100644
--- a/source/m3_env.h
+++ b/source/m3_env.h
@@ -187,6 +187,7 @@ IM3Function                 Module_GetFunction          (IM3Module i_module, u32
 //---------------------------------------------------------------------------------------------------------------------------------
 typedef struct M3Environment
 {
+    int dummmy;
     //  u32                     numFuncTypes;
     //  M3FuncType *            funcTypes;
 }