diff --git a/reactos/config.template.rbuild b/reactos/config.template.rbuild
index 799fecdeacc..2be123edcfd 100644
--- a/reactos/config.template.rbuild
+++ b/reactos/config.template.rbuild
@@ -42,7 +42,7 @@
 
 <!--
 	What level of optimisation to use.
-		0 = off (will not work)
+		0 = off
 		1 = Default option, optimize for size (-Os) with some additional options
 		2 = -Os
 		3 = -O1
diff --git a/reactos/include/crt/_mingw.h b/reactos/include/crt/_mingw.h
index 15d5e8c96d1..38764c75c69 100644
--- a/reactos/include/crt/_mingw.h
+++ b/reactos/include/crt/_mingw.h
@@ -58,9 +58,9 @@
 # define __CRT_INLINE inline
 #else
 # if ( __MINGW_GNUC_PREREQ(4, 3)  &&  __STDC_VERSION__ >= 199901L)
-#  define __CRT_INLINE extern inline __attribute__((__gnu_inline__))
+#  define __CRT_INLINE extern inline __attribute__((__always_inline__,__gnu_inline__))
 # else
-#  define __CRT_INLINE extern __inline__
+#  define __CRT_INLINE extern __inline__ __attribute__((__always_inline__))
 # endif
 #endif
 
diff --git a/reactos/subsystems/win32/win32k/objects/drawing.c b/reactos/subsystems/win32/win32k/objects/drawing.c
index fed699d952e..5b7f1e59cb0 100755
--- a/reactos/subsystems/win32/win32k/objects/drawing.c
+++ b/reactos/subsystems/win32/win32k/objects/drawing.c
@@ -1265,8 +1265,8 @@ IntFillArc( PDC dc,
 {
   PDC_ATTR pdcattr;
   PBRUSH pbrush;
-  int Start = ceill(StartArc);
-  int End   = ceill(EndArc);
+  int Start = ceil(StartArc);
+  int End   = ceil(EndArc);
   BOOL Chord = (arctype == GdiTypeChord), ret;
 
   pdcattr = dc->pdcattr;
@@ -1300,8 +1300,8 @@ IntDrawArc( PDC dc,
             ARCTYPE arctype,
             PBRUSH pbrush)
 {
-  int Start = ceill(StartArc);
-  int End   = ceill(EndArc);
+  int Start = ceil(StartArc);
+  int End   = ceil(EndArc);
   BOOL Chord = (arctype == GdiTypeChord);
   // Sort out alignment here.
   return app_draw_arc(dc, rect( XLeft, YLeft, Width, Height),