仅用来记录一个小细节…这两天KlayGE升级了CMake版本要求3.4+，但是默认Ubuntu源或ppa上最多才到3.2，因此需要自己编译。下载源码之后直接编译安装没问题，但是遇到了如下错误
➜ KlayGE git:(develop) python build_external.py
Building boost Debug...
-- Downloading https://raw.githubusercontent.com/gongminmin/KlayGEDependencies/cbda47a1678ce70b6720856736100979d469e159/External/Downloads/linux_x64/7z...
CMake Error at /home/anthony/KlayGE/cmake/Common.cmake:123 (FILE):
file DOWNLOAD HASH mismatch
for file: [/home/anthony/KlayGE/External/boost/Build/cmake/../../../../External/Downloads/linux_x64/7z]
expected hash: [277d58cae5405ec65c4d2eb3d49b28128158f008]
actual hash: [da39a3ee5e6b4b0d3255bfef95601890afd80709]
status: [1;"Unsupported protocol"]
Call Stack (most recent call first):
/home/anthony/KlayGE/External/Build/CMake/ExternalCommon.cmake:21 (DOWNLOAD_FILE)
/home/anthony/KlayGE/External/Build/CMake/ExternalCommon.cmake:29 (DOWNLOAD_7Z)
CMakeLists.txt:35 (DOWNLOAD_PACKAGE)
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这里是下载https文件出错，因为默认CMake的编译参数是不支持的。参考Unsupported protocol while downlod tar.gz package需要进行如下修改
sudo apt-get install libcurl4-openssl-dev
./bootstrap --system-curl
make
sudo make install
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这样就正常了
