Hi, 

I am using Mac OS just updated my Xcode as MacOSX10.13.sdk. Then I got a 
error during compiling
No rule to make target 
`/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk/System/Library/Frameworks/Accelerate.framework'

Indeed there is only  /MacOSX10.13.sdk there, so I put a symbolic link using
sudo ln -s 
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk
 
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk

and compile again, Then I got some error like 

*/Library/Developer/CommandLineTools/usr/include/c++/v1/cmath:313:9: **error: 
**no member named 'signbit' in the global*

*      namespace*
using ::signbit;  

But when I delete the symbolic link I created, and compile again, it works 
but shot me a warning finally

warning: directory not found for option 
'-F/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk/System/Library/Frameworks'


I wonder is there any cleaner way to fix the problem? Since every time I 
compile a new code, I need to that again. 


thanks,

Zhenlin

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