message: depends: Use default macos clang compiler
  Suggested by Cory Fields
  as alternate workaround for problem described
diff: -build_darwin_CC:=$(shell xcrun -f clang)
  -build_darwin_CXX:=$(shell xcrun -f clang++)
  +build_darwin_CC:=clang
  +build_darwin_CXX:=clang++
  build_darwin_AR:=$(shell xcrun -f ar)
  build_darwin_RANLIB:=$(shell xcrun -f ranlib)
  build_darwin_STRIP:=$(shell xcrun -f strip)
  