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diff --git a/README b/README
index 1cc99950c1c..d7eb8052644 100644
--- a/README
+++ b/README
@@ -82,6 +82,19 @@ This is Mono.
 		./autogen.sh --prefix=/usr/local
 		make
 
+	For people with non-standard installations of the auto* utils and of
+	pkg-config (common on misconfigured OSX and windows boxes), you could get
+	an error like this:
+
+	./configure: line 19176: syntax error near unexpected token `PKG_CHECK_MODULES(BASE_DEPENDENCIES,' ...
+
+	This means that you need to set the ACLOCAL_FLAGS environment var
+	when invoking autogen.sh, like this:
+
+		ACLOCAL_FLAGS="-I $acprefix/share/aclocal" ./autogen.sh --prefix=/usr/loca
+	
+	where $acprefix is the prefix where aclocal has been installed.
+
 	This will automatically go into the mcs/ tree and build the
 	binaries there.
 
@@ -195,6 +208,10 @@ This is Mono.
 
 	--with-sigaltstack=yes,no
 
+		Experimental: Use at your own risk, it is known to
+		cause problems with garbage collection and is hard to
+	 	reproduce those bugs.
+
 		This controls whether Mono will install a special
 	  	signal handler to handle stack overflows.   If set to
 	  	"yes", it will turn stack overflows into the