diff --git a/SConstruct b/SConstruct
index a46d39e0b..a28b0552e 100644
--- a/SConstruct
+++ b/SConstruct
@@ -474,7 +474,7 @@ class DXXCommon(LazyObjectConstructor):
 		# -Werror=undef to make this fatal.  Both are needed, since
 		# gcc 4.5 silently ignores -Werror=undef.  On gcc 4.5, misuse
 		# produces a warning.  On gcc 4.7, misuse produces an error.
-		self.env.Append(CCFLAGS = ['-Wall', '-Wundef', '-Werror=undef', '-funsigned-char', '-Werror=implicit-int', '-Werror=implicit-function-declaration', '-Werror=format-security', '-pthread'])
+		self.env.Append(CCFLAGS = ['-Wall', '-Wundef', '-Werror=pointer-arith', '-Werror=undef', '-funsigned-char', '-Werror=implicit-int', '-Werror=implicit-function-declaration', '-Werror=format-security', '-pthread'])
 		self.env.Append(CFLAGS = ['-std=gnu99', '-Wwrite-strings'])
 		self.env.Append(CPPPATH = ['common/include', 'common/main', '.', self.user_settings.builddir])
 		if (self.user_settings.editor == 1):
diff --git a/similar/editor/info.c b/similar/editor/info.c
index 38f721231..e1494ccb3 100644
--- a/similar/editor/info.c
+++ b/similar/editor/info.c
@@ -313,6 +313,7 @@ void clear_pad_display(void)
 //	------------------------------------------------------------------------------------
 int info_display_all(window *wind, d_event *event, void *userdata)
 {
+	(void)userdata;
 	static int old_padnum = -1;
 	int        padnum,show_all = 1;		// always redraw
 	grs_canvas *save_canvas = grd_curcanv;
@@ -320,7 +321,6 @@ int info_display_all(window *wind, d_event *event, void *userdata)
 	switch (event->type)
 	{
 		case EVENT_WINDOW_DRAW:
-			userdata++;		//kill warning
 
 			gr_set_current_canvas(window_get_canvas(wind));