diff --git a/ext/opencv/extconf.rb b/ext/opencv/extconf.rb
index 0402197..c1a59dc 100755
--- a/ext/opencv/extconf.rb
+++ b/ext/opencv/extconf.rb
@@ -70,6 +70,9 @@ opencv_headers.each {|header|
 }
 have_header("stdarg.h")
 
+$warnflags.slice!('-Wdeclaration-after-statement')
+$warnflags.slice!('-Wimplicit-function-declaration')
+
 # Quick fix for 1.8.7
 $CFLAGS << " -I#{File.dirname(__FILE__)}/ext/opencv"