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-rw-r--r--docs/building/building.sgml3
1 files changed, 2 insertions, 1 deletions
diff --git a/docs/building/building.sgml b/docs/building/building.sgml
index 97eb460509..d26fd63433 100644
--- a/docs/building/building.sgml
+++ b/docs/building/building.sgml
@@ -2652,7 +2652,8 @@ guide) before continuing to read these notes.
<para>
Before you start, make sure you've installed the Cygwin packages
<filename>openssh</filename>, <filename>openssl</filename>,
-<filename>cvs</filename>, <filename>gdbm</filename> (needed by cvs), <filename>m4</filename> and
+<filename>cvs</filename>, <filename>gdbm</filename> (needed by cvs),
+<filename>zlib</filename> (needed by cvs), <filename>m4</filename> and
<filename>autoconf</filename>. Do not install the <filename>cygwin</filename>
package; the bits of it you need are supplied with GHC. You also need to make sure that the
user environment variable <Constant>MAKE_MODE</Constant> is set to <Literal>UNIX</Literal>. If you don't do