installation failure on MacOS Mojave

The failure occurs while compiling src/unix/darwin-proctitle.c through libuv during httpuv installation. Start by reproducing the CRAN or development installation with the reported MacOS Mojave CommandLineTools SDK, then inspect the related build inputs. Done means httpuv installs successfully without the reported compiler errors.

Trying to install both the latest version from CRAN as well as the development version, I am getting an installation failure error:

In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Security.framework/Headers/AuthSession.h:32,
                 from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Security.framework/Headers/Security.h:42,
                 from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreServices.framework/Frameworks/OSServices.framework/Headers/CSIdentity.h:43,
                 from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreServices.framework/Frameworks/OSServices.framework/Headers/OSServices.h:29,
                 from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Headers/IconsCore.h:23,
                 from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Headers/LaunchServices.h:23,
                 from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreServices.framework/Headers/CoreServices.h:45,
                 from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/ApplicationServices.framework/Headers/ApplicationServices.h:23,
                 from src/unix/darwin-proctitle.c:33:
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Security.framework/Headers/Authorization.h:193:7: error: variably modified 'bytes' at file scope
  193 |  char bytes[kAuthorizationExternalFormLength];
      |       ^~~~~
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreGraphics.framework/Headers/CGContext.h:21,
                 from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreGraphics.framework/Headers/CGBitmapContext.h:9,
                 from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreGraphics.framework/Headers/CoreGraphics.h:11,
                 from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/ApplicationServices.framework/Headers/ApplicationServices.h:35,
                 from src/unix/darwin-proctitle.c:33:
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreGraphics.framework/Headers/CGPath.h:391:15: error: expected identifier or '(' before '^' token
  391 | typedef void (^CGPathApplyBlock)(const CGPathElement * element);
      |               ^
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreGraphics.framework/Headers/CGPath.h:393:53: error: unknown type name 'CGPathApplyBlock'
  393 | CG_EXTERN void CGPathApplyWithBlock(CGPathRef path, CGPathApplyBlock CF_NOESCAPE block)
      |                                                     ^~~~~~~~~~~~~~~~
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreGraphics.framework/Headers/CGPDFDictionary.h:14,
                 from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreGraphics.framework/Headers/CGPDFPage.h:15,
                 from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreGraphics.framework/Headers/CGPDFDocument.h:16,
                 from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreGraphics.framework/Headers/CGContext.h:23,
                 from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreGraphics.framework/Headers/CGBitmapContext.h:9,
                 from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreGraphics.framework/Headers/CoreGraphics.h:11,
                 from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/ApplicationServices.framework/Headers/ApplicationServices.h:35,
                 from src/unix/darwin-proctitle.c:33:
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreGraphics.framework/Headers/CGPDFArray.h:103:15: error: expected identifier or '(' before '^' token
  103 | typedef bool (^CGPDFArrayApplierBlock)(size_t index,
      |               ^
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreGraphics.framework/Headers/CGPDFArray.h:113:5: error: unknown type name 'CGPDFArrayApplierBlock'
  113 |     CGPDFArrayApplierBlock cg_nullable block, void * __nullable info)
      |     ^~~~~~~~~~~~~~~~~~~~~~
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreGraphics.framework/Headers/CGPDFPage.h:15,
                 from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreGraphics.framework/Headers/CGPDFDocument.h:16,
                 from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreGraphics.framework/Headers/CGContext.h:23,
                 from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreGraphics.framework/Headers/CGBitmapContext.h:9,
                 from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreGraphics.framework/Headers/CoreGraphics.h:11,
                 from /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/ApplicationServices.framework/Headers/ApplicationServices.h:35,
                 from src/unix/darwin-proctitle.c:33:
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreGraphics.framework/Headers/CGPDFDictionary.h:116:15: error: expected identifier or '(' before '^' token
  116 | typedef bool (^CGPDFDictionaryApplierBlock)(const char * key,
      |               ^
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/CoreGraphics.framework/Headers/CGPDFDictionary.h:126:5: error: unknown type name 'CGPDFDictionaryApplierBlock'; did you mean 'CGPDFDictionaryApplierFunction'?
  126 |     CGPDFDictionaryApplierBlock cg_nullable block, void * __nullable info)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~
      |     CGPDFDictionaryApplierFunction
make[1]: *** [src/unix/libuv_la-darwin-proctitle.lo] Error 1
make: *** [libuv/.libs/libuv.a] Error 2
ERROR: compilation failed for package ‘httpuv’
* removing ‘/Users/carendt/Library/R/3.4/library/httpuv’
* restoring previous ‘/Users/carendt/Library/R/3.4/library/httpuv’
Warning in install.packages :
  installation of package ‘httpuv’ had non-zero exit status

The downloaded source packages are in
	‘/private/var/folders/57/dxvpk1d97z3dvlxxp22d0t9m0000gn/T/RtmpP75rqj/downloaded_packages’

brew install libuv seems to have had no effect, although I'm not sure if I expected it to 😄 Unsure of where to go from here.