[Ves] build by Xcode 6 error

[liuliu]

hi, all i want compile ves to get vtk-framework and kiwi-framework. i use cmake generate VES_SUPERBUILD.xcodeproj. open it by Xcode 6.2 

I need some help. Here is the error message.

PhaseScriptExecution CMake\ Rules /Users/baojy/Desktop/build/VES_SUPERBUILD.build/Debug/curl-ios-device.build/Script-A82E4D7595134083BF75A315.sh
    cd /Users/baojy/Desktop/VES
    /bin/sh -c /Users/baojy/Desktop/build/VES_SUPERBUILD.build/Debug/curl-ios-device.build/Script-A82E4D7595134083BF75A315.sh

echo "Performing configure step for 'curl-ios-device'"
Performing configure step for 'curl-ios-device'
cd /Users/baojy/Desktop/build/CMakeExternals/Build/curl-ios-device && /Applications/CMake.app/Contents/bin/cmake -DCMAKE_INSTALL_PREFIX:PATH=/Users/baojy/Desktop/build/CMakeExternals/Install/curl-ios-device -DCMAKE_BUILD_TYPE:STRING=Release -DCURL_STATICLIB:BOOL=ON -DBUILD_CURL_EXE:BOOL=OFF -DBUILD_CURL_TESTS:BOOL=OFF -DCMAKE_TOOLCHAIN_FILE:FILEPATH=/Users/baojy/Desktop/VES/CMake/toolchains/toolchain-ios-device.cmake -C /Users/baojy/Desktop/VES/CMake/toolchains/curl-TryRunResults.cmake -GXcode /Users/baojy/Desktop/build/CMakeExternals/Source/curl
loading initial cache file /Users/baojy/Desktop/VES/CMake/toolchains/curl-TryRunResults.cmake
CMake Error at /Users/baojy/Desktop/VES/CMake/toolchains/toolchain-ios-device.cmake:38 (message):
  Could not find a usable iOS SDK in
Call Stack (most recent call first):
  /Applications/CMake.app/Contents/share/cmake-3.2/Modules/CMakeDetermineSystem.cmake:98 (include)
  CMakeLists.txt:24 (project)


CMake Error: Could not find cmake module file: /Users/baojy/Desktop/build/CMakeExternals/Build/curl-ios-device/CMakeFiles/3.2.1/CMakeCCompiler.cmake
CMake Error at CMakeLists.txt:24 (project):
  No CMAKE_C_COMPILER could be found.



-- Configuring incomplete, errors occurred!
make: *** [/Users/baojy/Desktop/build/CMakeExternals/Stamp/curl-ios-device/Debug/curl-ios-device-configure] Error 1
Command /bin/sh failed with exit code 2
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