README: Document glibtoolize use on Mac systems

Fixes #224

diff --git a/README.md b/README.md
index 38826bcf588b4fd06354b739522ccbd40701bb00..b7509608fbf0e028c21dc48e8738564b71bd2324 100644 (file)
--- a/README.md
+++ b/README.md
@@ -50,6 +50,13 @@ Anything else that hasn't been tested. Charybdis may or may not work on it; patc
 
 These are known issues and workarounds for supported platforms.
 
+ * **Mac OS X and macOS **: you must set the LIBTOOLIZE environment
+   variable to point to glibtoolize before running autogen.sh:
+   `$ brew install libtool`
+   `$ LIBTOOLIZE="/opt/local/bin/glibtoolize"`
+   `$ export LIBTOOLIZE`
+   `$ ./autogen.sh`
+
  * **FreeBSD**: if you are compiling with ipv6 you may experience
    problems with ipv4 due to the way the socket code is written.  To
    fix this you must: "sysctl net.inet6.ip6.v6only=0"