README.md: add info about make dist
diff --git a/README.md b/README.md
index 35f0a80..3e386db 100644
--- a/README.md
+++ b/README.md
@@ -39,6 +39,10 @@
     $ make all
     $ ./bin/cmk
 
+To build for all distros and platforms, run:
+
+    $ make dist
+
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