diff --git a/README b/README
index fd5fa8d1..6e6ace45 100644
--- a/README
+++ b/README
@@ -9,7 +9,7 @@ Binary-based efficient data interchange format.
   UNIX-like platforms.
 
   Following programs is required to build:
-    - gcc >= 4.0 with C++ support
+    - gcc >= 4.1 with C++ support
     - ruby >= 1.8   (ruby is used as a preprocessor)
 
 
diff --git a/bootstrap b/bootstrap
index eb16c351..9ddb3da3 100755
--- a/bootstrap
+++ b/bootstrap
@@ -35,6 +35,7 @@ fi
 #	cd c   && ./bootstrap $@; cd ..
 #	cd cpp && ./bootstrap $@; cd ..
 #fi
+mkdir -p ac
 
 
 ACLOCAL="aclocal"
diff --git a/configure.in b/configure.in
index d7bb9265..2c1bee74 100644
--- a/configure.in
+++ b/configure.in
@@ -1,4 +1,5 @@
 AC_INIT(msgpack/unpack_template.h)
+AC_CONFIG_AUX_DIR(ac)
 AM_INIT_AUTOMAKE(msgpack, 0.3.0)
 AC_CONFIG_HEADER(config.h)