Add notes for building on FreeBSD.

diff --git a/README.md b/README.md
index c37acc819237c748112b337acb7fccdbe5ac5bbe..a5411a05d40f806ead78f2c56c0cbd4b0c263349 100644 (file)
--- a/README.md
+++ b/README.md
@@ -89,6 +89,10 @@ FREEBSD NOTES
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 You need to compile using gmake - regular make only appears to work, but doesn't in fact. Use gmake, not make.
 
+The clang compiler installed through FreeBSD's package manager does not expose all of the C++11 features needed under `std=gnuc++11`. Force the compiler to use `std=c++11` mode instead.
+
+    export CXXFLAGS=-std=c++11
+
 MAC OS X NOTES
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 PowerDNS Authoritative Server is available through Homebrew: