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diff --git a/README.SELF-CONTAINED-EXTENSIONS b/README.SELF-CONTAINED-EXTENSIONS
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--- a/README.SELF-CONTAINED-EXTENSIONS
+++ b/README.SELF-CONTAINED-EXTENSIONS
@@ -14,6 +14,19 @@ HOW TO CREATE A SELF-CONTAINED PHP EXTENSION
We will describe now how to create these and how to put things
together.
+PREPARING YOUR SYSTEM
+
+ While the result will run on any system, a developer's setup needs these
+ tools:
+
+ GNU autoconf
+ GNU automake
+ GNU libtool
+ GNU m4
+
+ All of these are available from
+
+ ftp://ftp.gnu.org/pub/gnu/
CONVERTING AN EXISTING EXTENSION