Update README.md

Author: rmusial

README.md

@@ -107,6 +107,10 @@ Install with
 It copies mbpfan to /usr/sbin, mbpfan.conf to /etc, 
 README.md to /usr/share/doc/mbpfan, and mbpfan.8.gz to /usr/share/man/man8
 
+Compile with Clang
+-------------------------
+Edit the 'Makefile' and replace G++ with clang++
+Tested and working with Clang 3.9
 
 Run The Tests (Recommended)
 ---------------------------