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Fix broken link to download libc++ #141

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Fix broken link to download libc++ #141

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2 changes: 1 addition & 1 deletion BUILDING.md
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Expand Up @@ -40,7 +40,7 @@ Pass any value, like "1" to skip this part.

### Xcode and libc++
Xcode currently comes with an old version of libc++ which lacks many of C++17 features required by IO2D.
The easiest solution is to download a fresh build of libc++ from [here](http://releases.llvm.org/6.0.0/clang+llvm-6.0.0-x86_64-apple-darwin.tar.xz).
The easiest solution is to download a fresh build of libc++ from [here](https://github.com/llvm/llvm-project/releases) or build from [source](https://releases.llvm.org/12.0.0/projects/libcxx/docs/BuildingLibcxx.html).
Export appropriate CXX and LD flags to make clang use this version of the standard library (replace NEWPATH with a path of extracted archive contents):
```
export CXXFLAGS="-nostdinc++ -isystemNEWPATH/include/c++/v1"
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