fix

cmake/OS_Detection.cmake

 if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
     set(OS_TYPE_DESKTOP ON)
-    set(LINUX 1)
+    set(LINUX ON)
+    set(UNIX ON)
     EXECUTE_PROCESS( COMMAND cat /etc/os-release COMMAND grep VERSION_CODENAME COMMAND sed s/VERSION_CODENAME=// COMMAND tr -d '\n' OUTPUT_VARIABLE L_DEBIAN_OS_NAME)
     EXECUTE_PROCESS( COMMAND cat /etc/os-release COMMAND grep VERSION_ID COMMAND sed s/VERSION_ID=// COMMAND tr -d '\n' COMMAND sed s/\\x22// COMMAND sed s/\\x22// OUTPUT_VARIABLE L_DEBIAN_OS_VERSION)
     SET(DEBIAN_OS_NAME "${L_DEBIAN_OS_NAME}")
@@ -10,8 +11,9 @@ if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
     EXECUTE_PROCESS( COMMAND uname -o COMMAND tr -d '\n' OUTPUT_VARIABLE OPERATING_SYSTEM)
 elseif(${CMAKE_SYSTEM_NAME} MATCHES "Android")
     message("ANDROID")
-    set(ANDROID 1)
-    set(LINUX 1)
+    set(ANDROID ON)
+    set(UNIX ON)
+    set(LINUX ON)
     set(OS_TYPE_MOBILE ON)
     message("ANDROID build")
     add_definitions(-DANDROID -DDAP_OS_ANDROID)