Add Build For A Specific OS And Architecture as a go til

README.md

@@ -10,7 +10,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 For a steady stream of TILs from a variety of rocketeers, checkout
 [til.hashrocket.com](https://til.hashrocket.com/).
 
-_633 TILs and counting..._
+_634 TILs and counting..._
 
 ---
 
@@ -206,6 +206,7 @@ _633 TILs and counting..._
 ### Go
 
 - [Access Go Docs Offline](go/access-go-docs-offline.md)
+- [Build For A Specific OS And Architecture](go/build-for-a-specific-os-and-architecture.md)
 - [Not So Random](go/not-so-random.md)
 - [Replace The Current Process With An External Command](go/replace-the-current-process-with-an-external-command.md)
 - [Sleep For A Duration](go/sleep-for-a-duration.md)

go/build-for-a-specific-os-and-architecture.md

@@ -0,0 +1,17 @@
+# Build For A Specific OS and Architecture
+
+Go programs can run anywhere, but you've got to create builds specific to
+each operating system and architecture. This can be done when building by
+specifying the `GOOS` and `GOARCH` environment variables.
+
+For example, if you'd like to build a 32-bit Linux distribution:
+
+```bash
+GOOS=linux GOARCH=386 go build -o linux_386_build
+```
+
+The `GOOS` value specifies the operating system as Linux and the `GOARCH`
+value of `386` specifies a 32-bit architecture.
+
+The plethora of `GOOS` and `GOARCH` options can be found
+[here](https://golang.org/doc/install/source#environment).