diff --git a/reactos/CMakeLists.txt b/reactos/CMakeLists.txt
index d1f8eb3276f..b65cdc759d9 100644
--- a/reactos/CMakeLists.txt
+++ b/reactos/CMakeLists.txt
@@ -37,7 +37,7 @@ elseif(ARCH MATCHES arm)
     include(config-arm.cmake)
 endif()
 
-add_definitions(-D__REACTOS__)
+add_definitions(-D__REACTOS__ __ROS_CMAKE__)
 
 if(NOT CMAKE_CROSSCOMPILING)
 
diff --git a/reactos/include/reactos/rossym.h b/reactos/include/reactos/rossym.h
index 41212f45bca..4bdf02f0e5f 100644
--- a/reactos/include/reactos/rossym.h
+++ b/reactos/include/reactos/rossym.h
@@ -33,7 +33,17 @@ typedef struct _ROSSYM_CALLBACKS {
   BOOLEAN (*SeekFileProc)(PVOID FileContext, ULONG_PTR Position);
 } ROSSYM_CALLBACKS, *PROSSYM_CALLBACKS;
 
+#ifdef __ROS_CMAKE__
+typedef struct _ROSSYM_OWN_FILECONTEXT {
+  BOOLEAN (*ReadFileProc)(PVOID FileContext, PVOID Buffer, ULONG Size);
+  BOOLEAN (*SeekFileProc)(PVOID FileContext, ULONG_PTR Position);
+} ROSSYM_OWN_FILECONTEXT, *PROSSYM_OWN_FILECONTEXT;
+
+struct Dwarf;
+typedef struct Dwarf *PROSSYM_INFO;
+#else
 typedef struct _ROSSYM_INFO *PROSSYM_INFO;
+#endif
 
 VOID RosSymInit(PROSSYM_CALLBACKS Callbacks);
 VOID RosSymInitKernelMode(VOID);