如何在MacOS10.12下安装libcurl并用于Xcode？

大家好：
??????这是我的第一个堆栈溢出问题.我已经阅读过之前发布的博客,但我还是无法完成构建.我不熟悉终端编程.首先让我向您展示一些关于我的Mac上的xcode的基本信息.

`Wuqians-MBP:~ wuqianzhong$xcode-select -p
/Applications/Xcode.app/Contents/Developer
Wuqians-MBP:~ wuqianzhong$g++ -v
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 8.0.0 (clang-800.0.42.1)
Target: x86_64-apple-darwin16.3.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin`

然后我输入了从博客Building libCURL for iOS 4.2.中学到的以下4行

export CC=“/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang”

export CFLAGS="-arch x86_64 -pipe -Os -gdwarf-2 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Deveoper/SDKs/iPhoneOS10.2.sdk"

export LDFLAGS="-arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS10.2.sdk"

?./configure --host=x86_64-apple-darwin --with-zlib --disable-shared --enable-static --disable-ipv6 --disable-manual --disable-verbose

但是,结果表明我没有正确构建.即使C编译器也不起作用.

checking whether to enable maintainer-specific portions of Makefiles... no
checking whether make supports nested variables... yes
checking whether to enable debug build options... no
checking whether to enable compiler optimizer... (assumed) yes
checking whether to enable strict compiler warnings... no
checking whether to enable compiler warnings as errors... no
checking whether to enable curl debug memory tracking... no
checking whether to enable hiding of library internal symbols... yes
checking whether to enable c-ares for DNS lookups... no
checking whether to disable dependency on -lrt... (assumed no)
checking for path separator... :
checking for sed... /usr/bin/sed
checking for grep... /usr/bin/grep
checking for egrep... /usr/bin/grep -E
checking for x86_64-apple-darwin-ar... no
checking for ar... /usr/bin/ar
checking for a BSD-compatible install... /usr/bin/install -c
checking for x86_64-apple-darwin-gcc... “/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang”
checking whether the C compiler works... no
configure: error: in `/Users/wuqianzhong/Desktop/curl-7.52.1':
configure: error: C compiler cannot create executables
See `config.log' for more details