4.0 is significantly slower than 4.1+


git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@150 632fc199-4ca6-4c93-a231-07263d6284db
diff --git a/BUILDING.txt b/BUILDING.txt
index a9cdcae..9611766 100644
--- a/BUILDING.txt
+++ b/BUILDING.txt
@@ -33,7 +33,7 @@
 
    NOTE: NASM build will fail if texinfo is not installed.
 
--- GCC v4 or later recommended for best performance
+-- GCC v4.1 or later recommended for best performance
 
 ======================
 Building libjpeg-turbo