Doc: CG: update requirements for doc build.

diff --git a/Documentation/included/compile.itexi b/Documentation/included/compile.itexi
index e10871b925e193a1a83ea645112c141658448e48..498bbfd33875d0984011b5ec268743491f43e7c2 100644 (file)
--- a/Documentation/included/compile.itexi
+++ b/Documentation/included/compile.itexi
@@ -188,6 +188,8 @@ LilyPond}
 
 @item @uref{http://netpbm.sourceforge.net/, Netpbm}
 
+@item @uref{http://gzip.org/, gzip}
+
 @item @uref{http://rsync.samba.org/, rsync}
 
 @item @uref{http://www.nongnu.org/texi2html/, Texi2HTML} (1.82)