diff --git a/build/linux/aarch64/arm.linux.cross.cmake b/build/linux/aarch64/arm.linux.cross.cmake
index 6e438268..3e6c9f19 100644
--- a/build/linux/aarch64/arm.linux.cross.cmake
+++ b/build/linux/aarch64/arm.linux.cross.cmake
@@ -9,4 +9,4 @@ SET(CMAKE_SYSTEM_PROCESSOR "armv8")
 
 add_definitions(-fPIC)
 add_definitions(-DARMLINUX)
-
+add_definitions(-D__gnu_linux__)
diff --git a/build/linux/arm/arm.linux.cross.cmake b/build/linux/arm/arm.linux.cross.cmake
index 4d44989c..67f292b4 100644
--- a/build/linux/arm/arm.linux.cross.cmake
+++ b/build/linux/arm/arm.linux.cross.cmake
@@ -9,4 +9,4 @@ SET(CMAKE_SYSTEM_PROCESSOR "armv7-a_hardfp")
 
 add_definitions(-fPIC)
 add_definitions(-DARMLINUX)
-
+add_definitions(-D__gnu_linux__)
diff --git a/osal/android/os_allocator.c b/osal/android/os_allocator.c
index c3107765..018aa05c 100644
--- a/osal/android/os_allocator.c
+++ b/osal/android/os_allocator.c
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#if defined(__ANDROID__)
 #include "allocator_std.h"
 #include "allocator_ion.h"
 #include "allocator_drm.h"
@@ -47,4 +48,4 @@ MPP_RET os_allocator_get(os_allocator *api, MppBufferType type)
     }
     return ret;
 }
-
+#endif
diff --git a/osal/android/os_env.c b/osal/android/os_env.c
index bcdb2b7a..af2bdb13 100644
--- a/osal/android/os_env.c
+++ b/osal/android/os_env.c
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#if defined(__ANDROID__)
 #include <stdio.h>
 #include <stdlib.h>
 #include <errno.h>
@@ -74,4 +75,4 @@ RK_S32 os_set_env_str(const char *name, char *value)
     return (len) ? (0) : (-1);
 }
 
-
+#endif
diff --git a/osal/android/os_log.c b/osal/android/os_log.c
index 0ad60798..546faaf2 100644
--- a/osal/android/os_log.c
+++ b/osal/android/os_log.c
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#if defined(__ANDROID__)
 #include <android/log.h>
 
 void os_log(const char* tag, const char* msg, va_list list)
@@ -25,4 +26,4 @@ void os_err(const char* tag, const char* msg, va_list list)
 {
     __android_log_vprint(ANDROID_LOG_ERROR, tag, msg, list);
 }
-
+#endif
diff --git a/osal/android/os_mem.c b/osal/android/os_mem.c
index e0499fa7..52cdf0e6 100644
--- a/osal/android/os_mem.c
+++ b/osal/android/os_mem.c
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#if defined(__ANDROID__)
 #include <stdlib.h>
 #include "os_mem.h"
 
@@ -45,4 +46,4 @@ void os_free(void *ptr)
 {
     free(ptr);
 }
-
+#endif
diff --git a/osal/linux/os_allocator.c b/osal/linux/os_allocator.c
index 749bfcf9..72fdc643 100644
--- a/osal/linux/os_allocator.c
+++ b/osal/linux/os_allocator.c
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#if defined(__gnu_linux__)
 #include "mpp_log.h"
 
 #include "allocator_std.h"
@@ -57,3 +58,4 @@ MPP_RET os_allocator_get(os_allocator *api, MppBufferType type)
     return ret;
 }
 
+#endif
diff --git a/osal/linux/os_env.c b/osal/linux/os_env.c
index 94e611ad..afe10d65 100644
--- a/osal/linux/os_env.c
+++ b/osal/linux/os_env.c
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#if defined(__gnu_linux__)
 #include <stdio.h>
 #include <stdlib.h>
 #include <errno.h>
@@ -60,4 +61,4 @@ RK_S32 os_set_env_str(const char *name, char *value)
     return setenv(name, value, 1);
 }
 
-
+#endif
diff --git a/osal/linux/os_log.c b/osal/linux/os_log.c
index 81df71d5..c426812d 100644
--- a/osal/linux/os_log.c
+++ b/osal/linux/os_log.c
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#if defined(__gnu_linux__)
 #include <stdio.h>
 #include <stdarg.h>
 #include "os_log.h"
@@ -34,3 +35,4 @@ void os_err(const char* tag, const char* msg, va_list list)
     vfprintf(stderr, line, list);
 }
 
+#endif
diff --git a/osal/linux/os_mem.c b/osal/linux/os_mem.c
index d4789dae..042531b6 100644
--- a/osal/linux/os_mem.c
+++ b/osal/linux/os_mem.c
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#if defined(__gnu_linux__)
 #include <stdlib.h>
 #include "os_mem.h"
 
@@ -34,3 +35,4 @@ void os_free(void *ptr)
     free(ptr);
 }
 
+#endif
diff --git a/osal/windows/os_allocator.c b/osal/windows/os_allocator.c
index 64c69045..cebb2619 100644
--- a/osal/windows/os_allocator.c
+++ b/osal/windows/os_allocator.c
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#if defined(_WIN32)
 #include "os_allocator.h"
 #include "allocator_std.h"
 
@@ -37,3 +38,4 @@ MPP_RET os_allocator_get(os_allocator *api, MppBufferType type)
     return ret;
 }
 
+#endif
diff --git a/osal/windows/os_env.c b/osal/windows/os_env.c
index ed6e8506..dfd55467 100644
--- a/osal/windows/os_env.c
+++ b/osal/windows/os_env.c
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#if defined(_WIN32)
 #include <stdio.h>
 #include <stdlib.h>
 #include "os_env.h"
@@ -61,4 +62,4 @@ RK_S32 os_set_env_str(const char *name, char *value)
     return _putenv(buf);
 }
 
-
+#endif
diff --git a/osal/windows/os_log.c b/osal/windows/os_log.c
index 51111804..0e2b7ba9 100644
--- a/osal/windows/os_log.c
+++ b/osal/windows/os_log.c
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#if defined(_WIN32)
 #include <stdio.h>
 #include <stdarg.h>
 
@@ -33,3 +34,4 @@ void os_err(const char* tag, const char* msg, va_list list)
     vfprintf(stderr, line, list);
 }
 
+#endif
diff --git a/osal/windows/os_mem.c b/osal/windows/os_mem.c
index 4da5f81d..b53274b2 100644
--- a/osal/windows/os_mem.c
+++ b/osal/windows/os_mem.c
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#if defined(_WIN32)
 #include <malloc.h>
 #include "os_mem.h"
 
@@ -34,3 +35,4 @@ void os_free(void *ptr)
     _aligned_free(ptr);
 }
 
+#endif
diff --git a/osal/windows/stdint.h b/osal/windows/stdint.h
index b49ae630..1440e485 100644
--- a/osal/windows/stdint.h
+++ b/osal/windows/stdint.h
@@ -1,3 +1,4 @@
+#if defined(_WIN32)
 #pragma once
 
 /* a minimal set of C99 types for use with MSVC */
@@ -11,3 +12,5 @@ typedef unsigned char uint8_t;
 typedef unsigned short int uint16_t;
 typedef unsigned int uint32_t;
 typedef unsigned __int64 uint64_t;
+
+#endif