diff --git a/trunk/auto/auto_headers.sh b/trunk/auto/auto_headers.sh
index 835e68683c..1174ce9b9c 100755
--- a/trunk/auto/auto_headers.sh
+++ b/trunk/auto/auto_headers.sh
@@ -43,29 +43,6 @@ echo "" >> $SRS_AUTO_HEADERS_H
 #####################################################################################
 # generate auto headers file, depends on the finished of options.sh
 #####################################################################################
-if [ $SRS_ARM_UBUNTU12 = YES ]; then
-    __SrsArmCC="arm-linux-gnueabi-gcc";
-    __SrsArmGCC="arm-linux-gnueabi-gcc";
-    __SrsArmCXX="arm-linux-gnueabi-g++";
-    __SrsArmAR="arm-linux-gnueabi-ar";
-    __SrsArmLD="arm-linux-gnueabi-ld";
-    __SrsArmRANDLIB="arm-linux-gnueabi-ranlib";
-fi
-if [ $SRS_MIPS_UBUNTU12 = YES ]; then
-    __SrsArmCC="mipsel-openwrt-linux-gcc";
-    __SrsArmGCC="mipsel-openwrt-linux-gcc";
-    __SrsArmCXX="mipsel-openwrt-linux-g++";
-    __SrsArmAR="mipsel-openwrt-linux-ar";
-    __SrsArmLD="mipsel-openwrt-linux-ld";
-    __SrsArmRANDLIB="mipsel-openwrt-linux-ranlib";
-fi
-# the arm-ubuntu12 options for make for depends
-if [[ -z $SrsArmCC ]]; then SrsArmCC=$__SrsArmCC; fi
-if [[ -z $SrsArmGCC ]]; then SrsArmGCC=$__SrsArmGCC; fi
-if [[ -z $SrsArmCXX ]]; then SrsArmCXX=$__SrsArmCXX; fi
-if [[ -z $SrsArmAR ]]; then SrsArmAR=$__SrsArmAR; fi
-if [[ -z $SrsArmLD ]]; then SrsArmLD=$__SrsArmLD; fi
-if [[ -z $SrsArmRANDLIB ]]; then SrsArmRANDLIB=$__SrsArmRANDLIB; fi
 # write to source file
 if [ $SRS_CROSS_BUILD = YES ]; then
     echo "cc=$SrsArmCC gcc=$SrsArmGCC g++=$SrsArmCXX ar=$SrsArmAR ld=$SrsArmLD randlib=$SrsArmRANDLIB"
diff --git a/trunk/auto/setup_variables.sh b/trunk/auto/setup_variables.sh
new file mode 100644
index 0000000000..d1d643b4ff
--- /dev/null
+++ b/trunk/auto/setup_variables.sh
@@ -0,0 +1,30 @@
+#!/bin/bash
+
+# when options parsed, setup some variables, then build the depends.
+
+# when arm specified, setup the cross build variables.
+if [ $SRS_ARM_UBUNTU12 = YES ]; then
+    __SrsArmCC="arm-linux-gnueabi-gcc";
+    __SrsArmGCC="arm-linux-gnueabi-gcc";
+    __SrsArmCXX="arm-linux-gnueabi-g++";
+    __SrsArmAR="arm-linux-gnueabi-ar";
+    __SrsArmLD="arm-linux-gnueabi-ld";
+    __SrsArmRANDLIB="arm-linux-gnueabi-ranlib";
+fi
+
+if [ $SRS_MIPS_UBUNTU12 = YES ]; then
+    __SrsArmCC="mipsel-openwrt-linux-gcc";
+    __SrsArmGCC="mipsel-openwrt-linux-gcc";
+    __SrsArmCXX="mipsel-openwrt-linux-g++";
+    __SrsArmAR="mipsel-openwrt-linux-ar";
+    __SrsArmLD="mipsel-openwrt-linux-ld";
+    __SrsArmRANDLIB="mipsel-openwrt-linux-ranlib";
+fi
+
+# the arm-ubuntu12 options for make for depends
+if [[ -z $SrsArmCC ]]; then SrsArmCC=$__SrsArmCC; fi
+if [[ -z $SrsArmGCC ]]; then SrsArmGCC=$__SrsArmGCC; fi
+if [[ -z $SrsArmCXX ]]; then SrsArmCXX=$__SrsArmCXX; fi
+if [[ -z $SrsArmAR ]]; then SrsArmAR=$__SrsArmAR; fi
+if [[ -z $SrsArmLD ]]; then SrsArmLD=$__SrsArmLD; fi
+if [[ -z $SrsArmRANDLIB ]]; then SrsArmRANDLIB=$__SrsArmRANDLIB; fi
diff --git a/trunk/configure b/trunk/configure
index 9534a6cdcf..4332b5d6b5 100755
--- a/trunk/configure
+++ b/trunk/configure
@@ -23,6 +23,9 @@ BLACK="\\033[0m"
 # parse options, exit with error when parse options invalid.
 . auto/options.sh
 
+# setup variables when options parsed.
+. auto/setup_variables.sh
+
 # clean the exists, when not export srs-librtmp.
 # do this only when the options is ok.
 if [[ -f Makefile ]]; then
diff --git a/trunk/ide/srs_xcode/srs_xcode.xcodeproj/project.pbxproj b/trunk/ide/srs_xcode/srs_xcode.xcodeproj/project.pbxproj
index a9b9fd3724..0e87334284 100644
--- a/trunk/ide/srs_xcode/srs_xcode.xcodeproj/project.pbxproj
+++ b/trunk/ide/srs_xcode/srs_xcode.xcodeproj/project.pbxproj
@@ -352,6 +352,7 @@
 		3C689F9B1AB6AAC800C9CEEE /* sched.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; name = sched.c; path = "../../objs/st-1.9/sched.c"; sourceTree = "<group>"; };
 		3C689F9C1AB6AAC800C9CEEE /* stk.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; name = stk.c; path = "../../objs/st-1.9/stk.c"; sourceTree = "<group>"; };
 		3C689F9D1AB6AAC800C9CEEE /* sync.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; name = sync.c; path = "../../objs/st-1.9/sync.c"; sourceTree = "<group>"; };
+		3CB25C281BB2596300C97A63 /* setup_variables.sh */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.script.sh; name = setup_variables.sh; path = ../../../auto/setup_variables.sh; sourceTree = "<group>"; };
 		3CC52DCA1ACE4023006FEB01 /* srs_utest_amf0.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = srs_utest_amf0.cpp; path = ../../src/utest/srs_utest_amf0.cpp; sourceTree = "<group>"; };
 		3CC52DCB1ACE4023006FEB01 /* srs_utest_amf0.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = srs_utest_amf0.hpp; path = ../../src/utest/srs_utest_amf0.hpp; sourceTree = "<group>"; };
 		3CC52DCC1ACE4023006FEB01 /* srs_utest_config.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = srs_utest_config.cpp; path = ../../src/utest/srs_utest_config.cpp; sourceTree = "<group>"; };
@@ -632,6 +633,7 @@
 				3C1232C31AAE827E00CE8F6C /* local_ip.sh */,
 				3C1232C41AAE827E00CE8F6C /* modules.sh */,
 				3C1232C51AAE827E00CE8F6C /* options.sh */,
+				3CB25C281BB2596300C97A63 /* setup_variables.sh */,
 				3C1232C61AAE827E00CE8F6C /* summary.sh */,
 				3C1232C71AAE827E00CE8F6C /* utest.sh */,
 			);