building.md

@@ -54,9 +54,12 @@ latest (development version) of easybuild.
 
 The support for Darwin is complete, but less well tested than Linux.
 
-- The Darwin build (and operation) requires a **case-sensitive file system**,
-  which is often created as a disk image and mounted (for older systems).
-- Compilation uses the system clang compiler.
+- Compilation uses the _system_ **clang** compiler.
+- The Darwin build (and operation) requires a ***case-sensitive file
+  system***. <br/>
+  _(For older systems, this can be created as a disk image and mounted_)
+
+  ![case-sensitive file-system](images/apple-APFS-screenshot.png)
 
 
 ### Known issues
@@ -69,8 +72,8 @@ CGAL
   cd $WM_THIRD_PARTY_DIR
   ./makeCGAL gmp-none mpfr-none
   ```
-  The `wmake/rules/darwin64Clang/CGAL` file has been adjusted to
-  eliminate references to gmp/mpfr libraries.
+  The `wmake/rules/darwin64Clang/cgal` file avoids references to
+  gmp/mpfr libraries.
 
 
 ## ![>](/icons/microsoft.svg) Windows (cross-compiled)