Hmm. my gcc / clang version is 11.0 is newer. I wonder why it is trying to 
install gcc?  

$ gcc --version
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr 
--with-gxx-include-dir=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/4.2.1
Apple clang version 11.0.0 (clang-1100.0.33.17)
Target: x86_64-apple-darwin18.7.0
Thread model: posix
InstalledDir: 
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

> On May 11, 2020, at 2:17 PM, 'Justin C. Walker' via sage-devel 
> <sage-devel@googlegroups.com> wrote:
> 
> 
> 
>> On May 11, 2020, at 12:08 , Robert Baertsch <robert.baert...@skytran.com> 
>> wrote:
>> 
>> [gcc-7.4.0] In file included from 
>> /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/sysctl.h:83:0,
>> [gcc-7.4.0]                  from ../../src/gcc/config/darwin-driver.c:30:
>> [gcc-7.4.0] 
>> /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/ucred.h:94:2:
>>  error: '_Atomic' does not name a type
>> [gcc-7.4.0]   _Atomic u_long          cr_ref;  /* reference count */
>> [gcc-7.4.0]   ^~~~~~~
>> [gcc-7.4.0] make[6]: *** [darwin-driver.o] Error 1
>> [gcc-7.4.0] make[5]: *** [all-stage2-gcc] Error 2
>> [gcc-7.4.0] make[4]: *** [stage2-bubble] Error 2
>> [gcc-7.4.0] make[3]: *** [all] Error 2
> 
> FWIW, I built sage 8.9 on 10.14.6 without problems, and sage’s gcc was not 
> built.  I have Xcode 10.2.1 installed, and gcc tells me that it’s 
> 
> Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr 
> --with-gxx-include-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/c++/4.2.1
> Apple LLVM version 10.0.1 (clang-1001.0.46.4)
> Target: x86_64-apple-darwin18.7.0
> Thread model: posix
> InstalledDir: 
> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
> 
> The fact that the installation is trying to build gcc means that either you 
> don’t have it installed, or it’s way out of date.  I think gcc 7.4 is way old 
> for macOS 10.14.
> 
> You could try installing the command-line tools for Xcode 10.2.1 and see what 
> happens.
> 
> HTH
> 
> Justin
> 
> --
> Justin C. Walker, Curmudgeon-At-Large
> Institute for the Absorption of Federal Funds
> --------
> If you're not confused,
> You're not paying attention
> --------
> 
> 
> 
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