diff --git a/reactos/include/ddk/driverspecs.h b/reactos/include/ddk/driverspecs.h
new file mode 100644
index 00000000000..abbf042ac41
--- /dev/null
+++ b/reactos/include/ddk/driverspecs.h
@@ -0,0 +1,29 @@
+/*
+ * PROJECT:         ReactOS DDK
+ * COPYRIGHT:       This file is in the Public Domain.
+ * FILE:            driverspecs.h
+ * ABSTRACT:        This header stubs out Driver Verifier annotations to
+ *                  allow drivers using them to compile with our header set.
+ */
+
+//
+// Stubs
+//
+#define __drv_dispatchType(x)
+#define __drv_dispatchType_other
+
+//
+// FIXME: These annotations are not driver-only and does not belong here
+//
+#define __in
+#define __in_bcount(Size)
+#define __in_ecount(Size)
+
+#define __out
+#define __out_bcount(Size)
+#define __out_bcount_part(Size, Length)
+#define __out_ecount(Size)
+
+#define __inout
+
+#define __deref_out_ecount(Size)
\ No newline at end of file
diff --git a/reactos/include/ddk/ntddser.h b/reactos/include/ddk/ntddser.h
index 39493ed33ea..c83147341f7 100644
--- a/reactos/include/ddk/ntddser.h
+++ b/reactos/include/ddk/ntddser.h
@@ -32,9 +32,13 @@ extern "C" {
 DEFINE_GUID(GUID_DEVINTERFACE_COMPORT,
   0x86e0d1e0L, 0x8089, 0x11d0, 0x9c, 0xe4, 0x08, 0x00, 0x3e, 0x30, 0x1f, 0x73);
 
+#define GUID_CLASS_COMPORT GUID_DEVINTERFACE_COMPORT
+
 DEFINE_GUID(GUID_DEVINTERFACE_SERENUM_BUS_ENUMERATOR,
   0x4D36E978L, 0xE325, 0x11CE, 0xBF, 0xC1, 0x08, 0x00, 0x2B, 0xE1, 0x03, 0x18);
 
+#define GUID_SERENUM_BUS_ENUMERATOR GUID_DEVINTERFACE_SERENUM_BUS_ENUMERATOR
+
 #define IOCTL_SERIAL_CLEAR_STATS \
   CTL_CODE (FILE_DEVICE_SERIAL_PORT, 36, METHOD_BUFFERED, FILE_ANY_ACCESS)
 #define IOCTL_SERIAL_CLR_DTR \
diff --git a/reactos/include/ddk/ntstrsafe.h b/reactos/include/ddk/ntstrsafe.h
index 8bb4d141235..e7a2653a020 100644
--- a/reactos/include/ddk/ntstrsafe.h
+++ b/reactos/include/ddk/ntstrsafe.h
@@ -31,13 +31,9 @@
 //
 typedef unsigned long DWORD;
 
-#ifndef UNIMPLEMENTED
-#define UNIMPLEMENTED DbgPrint("WARNING:  %s at %s:%d is UNIMPLEMENTED!\n",__FUNCTION__,__FILE__,__LINE__);
-#endif
-
 /* PRIVATE FUNCTIONS *********************************************************/
 
-FORCEINLINE
+__inline
 NTSTATUS
 NTAPI
 RtlStringLengthWorkerA(IN PCHAR String,
@@ -70,7 +66,7 @@ RtlStringLengthWorkerA(IN PCHAR String,
     return Status;
 }
 
-FORCEINLINE
+__inline
 NTSTATUS
 NTAPI
 RtlStringValidateDestA(IN PCHAR Destination,
@@ -99,7 +95,7 @@ RtlStringValidateDestA(IN PCHAR Destination,
     return Status;
 }
 
-FORCEINLINE
+__inline
 NTSTATUS
 NTAPI
 RtlStringExValidateDestA(IN OUT PCHAR *Destination,
@@ -108,14 +104,14 @@ RtlStringExValidateDestA(IN OUT PCHAR *Destination,
                          IN SIZE_T MaxLength,
                          IN DWORD Flags)
 {
-    //ASSERTMSG("We don't support Extended Flags yet!\n", Flags == 0);
+    ASSERTMSG("We don't support Extended Flags yet!\n", Flags == 0);
     return RtlStringValidateDestA(*Destination,
                                   *DestinationLength,
                                   ReturnLength,
                                   MaxLength);
 }
 
-FORCEINLINE
+__inline
 NTSTATUS
 NTAPI
 RtlStringExValidateSrcA(IN OUT PCCHAR *Source OPTIONAL,
@@ -124,7 +120,7 @@ RtlStringExValidateSrcA(IN OUT PCCHAR *Source OPTIONAL,
                         IN DWORD Flags)
 {
     NTSTATUS Status = STATUS_SUCCESS;
-    //ASSERTMSG("We don't support Extended Flags yet!\n", Flags == 0);
+    ASSERTMSG("We don't support Extended Flags yet!\n", Flags == 0);
 
     if ((ReturnLength) && (*ReturnLength >= MaxLength))
     {
@@ -134,7 +130,7 @@ RtlStringExValidateSrcA(IN OUT PCCHAR *Source OPTIONAL,
     return Status;
 }
 
-FORCEINLINE
+__inline
 NTSTATUS
 NTAPI
 RtlStringVPrintfWorkerA(OUT PCHAR Destination,
@@ -175,7 +171,7 @@ RtlStringVPrintfWorkerA(OUT PCHAR Destination,
     return Status;
 }
 
-FORCEINLINE
+__inline
 NTSTATUS
 NTAPI
 RtlStringCopyWorkerA(OUT PCHAR Destination,
@@ -212,6 +208,18 @@ RtlStringCopyWorkerA(OUT PCHAR Destination,
 
 /* PUBLIC FUNCTIONS **********************************************************/
 
+__inline
+NTSTATUS
+NTAPI
+RtlStringCchCopyA(IN PCHAR Destination,
+                  IN SIZE_T cchDest,
+                  IN PCCHAR pszSrc)
+{
+    ASSERTMSG("RtlStringCchCopyA is UNIMPLEMENTED!\n", FALSE);
+    return STATUS_NOT_IMPLEMENTED;
+}
+
+__inline
 NTSTATUS
 NTAPI
 RtlStringCbPrintfA(OUT PCHAR Destination,
@@ -241,6 +249,7 @@ RtlStringCbPrintfA(OUT PCHAR Destination,
     return Status;
 }
 
+__inline
 NTSTATUS
 NTAPI
 RtlStringCbPrintfExA(OUT PCHAR Destination,
@@ -255,7 +264,7 @@ RtlStringCbPrintfExA(OUT PCHAR Destination,
     SIZE_T CharLength = Length / sizeof(CHAR), Remaining, LocalNewLength = 0;
     PCHAR LocalDestinationEnd;
     va_list argList;
-    //ASSERTMSG("We don't support Extended Flags yet!\n", Flags == 0);
+    ASSERTMSG("We don't support Extended Flags yet!\n", Flags == 0);
 
     Status = RtlStringExValidateDestA(&Destination,
                                       &CharLength,
@@ -321,7 +330,7 @@ RtlStringCbPrintfExA(OUT PCHAR Destination,
     return Status;
 }
 
-FORCEINLINE
+__inline
 NTSTATUS
 NTAPI
 RtlStringCbCopyExA(OUT PCHAR Destination,
@@ -334,7 +343,7 @@ RtlStringCbCopyExA(OUT PCHAR Destination,
     NTSTATUS Status;
     SIZE_T CharLength = Length / sizeof(CHAR), Copied = 0, Remaining;
     PCHAR LocalDestinationEnd;
-    //ASSERTMSG("We don't support Extended Flags yet!\n", Flags == 0);
+    ASSERTMSG("We don't support Extended Flags yet!\n", Flags == 0);
 
     Status = RtlStringExValidateDestA(&Destination,
                                       &Length,
@@ -398,7 +407,7 @@ RtlStringCbCopyExA(OUT PCHAR Destination,
     return Status;
 }
 
-
+__inline
 NTSTATUS
 NTAPI
 RtlStringCbPrintfW(
@@ -407,11 +416,11 @@ RtlStringCbPrintfW(
     IN LPCWSTR pszFormat,
     ...)
 {
-    UNIMPLEMENTED
+    ASSERTMSG("RtlStringCbPrintfW is UNIMPLEMENTED!\n", FALSE);
     return STATUS_NOT_IMPLEMENTED;
 }
 
-FORCEINLINE
+__inline
 NTSTATUS
 NTAPI
 RtlStringCbCatExA(IN OUT PCHAR Destination,
@@ -425,7 +434,7 @@ RtlStringCbCatExA(IN OUT PCHAR Destination,
     SIZE_T CharLength = Length / sizeof(CHAR);
     SIZE_T DestinationLength, Remaining, Copied = 0;
     PCHAR LocalDestinationEnd;
-    //ASSERTMSG("We don't support Extended Flags yet!\n", Flags == 0);
+    ASSERTMSG("We don't support Extended Flags yet!\n", Flags == 0);
 
     Status = RtlStringExValidateDestA(&Destination,
                                       &CharLength,
@@ -485,7 +494,7 @@ RtlStringCbCatExA(IN OUT PCHAR Destination,
     return Status;
 }
 
-FORCEINLINE
+__inline
 NTSTATUS
 NTAPI
 RtlStringCbCopyA(OUT PCHAR Destination,
diff --git a/reactos/ntoskrnl/mm/sysldr.c b/reactos/ntoskrnl/mm/sysldr.c
index 4649b6e56bf..04a37b1ec9b 100644
--- a/reactos/ntoskrnl/mm/sysldr.c
+++ b/reactos/ntoskrnl/mm/sysldr.c
@@ -13,6 +13,7 @@
 #include <debug.h>
 
 /* GCC's incompetence strikes again */
+__inline
 VOID
 sprintf_nt(IN PCHAR Buffer,
            IN PCHAR Format,