+# - RCFL=/DNO_MANIFESTS (Windows only)
+# Disables inclusion of XML application manifests in the PuTTY
+# binaries. This may be necessary to build for 64-bit Windows;
+# the manifests are only included to use the XP GUI style on
+# Windows XP, and the architecture tags are a lie on 64-bit.
+#
+# - COMPAT=/DNO_IPV6
+# Disables PuTTY's ability to make IPv6 connections, enabling
+# it to compile under development environments which do not
+# support IPv6 in their header files.
+#
+# - COMPAT=/DMSVC4 (Windows only)