title: How to install libcurl under MacOS10.12 and use for Xcode?
body: <p><a href="http://www.creativealgorithms.com/blog/content/building-libcurl-ios-42" rel="noreferrer">Building libCURL for iOS 4.2</a></p>
  
  <p>Hello Guys:
        This is my first stack overflow question. I have read the blog posted before but I still cannot finish building. I am not familiar with the terminal programming. First let me show you some basic info about xcode on my mac.</p>
  
  <pre><code>`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`
  </code></pre>
  
  <p>Then I typed the following 4 lines learned from the blog <a href="http://www.creativealgorithms.com/blog/content/building-libcurl-ios-42" rel="noreferrer">Building libCURL for iOS 4.2.</a></p>
  
  <pre><code>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 
  </code></pre>
  
  <p>However, the result shows that I am not building correctly. Even the C complier is not working.</p>
  
  <pre><code>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
  </code></pre>