--- /dev/null
+64-bit Windows on AMD64/Intel EM64T is somewhat supported in the 7.0
+and later release. A collector can be built with Microsoft Visual C++ 2005
+or with mingw-w64 gcc.
+More testing would clearly be helpful.
+
+NT_X64_STATIC_THREADS_MAKEFILE has been used in
+this environment. Copy this file to MAKEFILE, and then type "nmake"
+in a Visual C++ command line window to build the static library
+and the usual test programs. To verify that the collector is
+at least somewhat functional, run gctest.exe. This should create
+gctest.gc.log after a few seconds.
+
+This process is completely analogous to NT_STATIC_THREADS_MAKEFILE
+for the 32-bit version.
+
+A similar procedure using NT_X64_THREADS_MAKEFILE should be usable to
+build the dynamic library. Test_cpp.exe did not seem to run correctly this
+way. It seems that we're getting the wrong instances of operator new/delete
+in some cases. The C tests seemed OK.
+
+Note that currently a few warnings are still generated by default,
+and a number of others have been explicitly turned off in the makefile.
+
+VC++ note: to suppress warnings use -D_CRT_SECURE_NO_DEPRECATE.
+
+gcc note: -fno-strict-aliasing should be used if optimizing.