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+# Minimum Requirements
+
+## Operating Systems
+
+### Linux
+
+Kernel kernel ????+
+
+We don't support CentOS 5. Kernel is too old.
+
+### Windows
+
+Windows XP or higher. But we don't currently (2016-09-23) have a Windows XP running. That is https://github.com/golang/go/issues/10267
+
+We run builders testing Go on Windows Server 2008 R2 Datacenter Edition. That is basically Windows 7 or above.
+
+### macOS (née OS X, aka Darwin)
+
+macOS Sierra (10.12) requires Go 1.7. We have not yet (as of 2016-09-23) backported the time system call fixes to any earlier Go versions. See https://github.com/golang/go/issues/16352.
+
+Go only supports OS X 10.8 (Snow Leopard) or newer. We only have builders for 10.8, 10.10, and 10.11 as of 2016-09-23.
+
+Go tip doesn't compile OS X 10.7 but binaries MAY work there. Maybe. No builders, no promises. We don't recommend it.
+
+OS X 10.6 is explicitly unsupported. See https://github.com/golang/go/issues/9511
+
+### OpenBSD
+
+The latest released version only.
+
+### DragonFly
+
+Generally only the latest release version only. We have a builder, but it's not the most stable of our ports.
+
+### FreeBSD
+
+???
+
+## Architectures
+
+### x86
+
+See https://golang.org/doc/install/source#environment
+
+Set GO386=387 or GO386=sse2 for older processors.
+
+### arm
+
+See https://golang.org/doc/install/source#environment
+
+* GOARM=5: use software floating point; when CPU doesn't have VFP co-processor
+* GOARM=6: use VFPv1 only; default if cross compiling; usually ARM11 or better cores (VFPv2 or better is also supported)
+* GOARM=7: use VFPv3; usually Cortex-A cores
+
+### arm64
+
+??
+
+### ppc64 (big endian)
+
+PPC 970 or newer.
+
+### ppc64le (big endian)
+
+### s390x
+
+z196+
