diff --git a/build/make/configure.sh b/build/make/configure.sh
index af45704db..3c772e5af 100755
--- a/build/make/configure.sh
+++ b/build/make/configure.sh
@@ -821,7 +821,8 @@ process_common_toolchain() {
 
         darwin*)
             if [ -z "${sdk_path}" ]; then
-                SDK_PATH=/Developer/Platforms/iPhoneOS.platform/Developer
+                SDK_PATH=`xcode-select -print-path 2> /dev/null`
+                SDK_PATH=${SDK_PATH}/Platforms/iPhoneOS.platform/Developer
             else
                 SDK_PATH=${sdk_path}
             fi
@@ -843,7 +844,7 @@ process_common_toolchain() {
             add_ldflags -arch_only ${tgt_isa}
 
             if [ -z "${alt_libc}" ]; then
-                alt_libc=${SDK_PATH}/SDKs/iPhoneOS5.0.sdk
+                alt_libc=${SDK_PATH}/SDKs/iPhoneOS5.1.sdk
             fi
 
             add_cflags  "-isysroot ${alt_libc}"