INSTALL: In prerequisites section, added Windows Cygwin.
diff --git a/INSTALL b/INSTALL
index f3b74b6..fc74ebf 100644
--- a/INSTALL
+++ b/INSTALL
@@ -14,6 +14,11 @@
 sudo apt-get install build-essential
 sudo apt-get install libssl-dev
 
+* Windows Cygwin
+Cygwin is tested on Windows 7 64-bit with the "Devel" packages selected to install at the top level of the
+cygwin installer.  This includes libcrypto and libsqlite3.
+
+
 Build
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