added a comment (see #109)

nlohmann · Dec 7, 2015 · e0d334c · e0d334c
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diff --git a/README.md b/README.md
@@ -46,6 +46,8 @@ Though it's 2015 already, the support for C++11 is still a bit sparse. Currently
 - Clang 3.4 - 3.7
 - Microsoft Visual C++ 14.0 RC
 
+Note using GCC 4.8, the unit tests cannot be compiled due to a [bug in the preprocessor](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55971).
+
 I would be happy to learn about other compilers/versions.
 
 ## Examples