diff --git a/linux.go b/linux.go
deleted file mode 100644
index 902ca76..0000000
--- a/linux.go
+++ /dev/null
@@ -1,48 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"os"
-	"os/exec"
-	"path/filepath"
-	"syscall"
-	"time"
-)
-
-func (p *Process) Start() {
-	command := []string{"/bin/bash", p.shellArgument(), fmt.Sprintf("source \"%s\" 2>/dev/null; %s", filepath.Join(p.Root, ".profile"), p.Command)}
-	p.cmd = exec.Command(command[0], command[1:]...)
-	p.cmd.Dir = p.Root
-	p.cmd.Env = p.envAsArray()
-	p.cmd.Stdin = p.Stdin
-	p.cmd.Stdout = p.Stdout
-	p.cmd.Stderr = p.Stderr
-	if !p.Interactive {
-		p.cmd.SysProcAttr = &syscall.SysProcAttr{}
-		p.cmd.SysProcAttr.Setsid = true
-	}
-	p.cmd.Start()
-}
-
-func (p *Process) Signal(signal syscall.Signal) {
-	if p.Running() {
-		group, _ := os.FindProcess(-1 * p.Pid())
-		group.Signal(signal)
-	}
-}
-
-func ShutdownProcesses(of *OutletFactory) {
-	shutdown_mutex.Lock()
-	of.SystemOutput("shutting down")
-	for name, ps := range processes {
-		of.SystemOutput(fmt.Sprintf("sending SIGTERM to %s", name))
-		ps.Signal(syscall.SIGTERM)
-	}
-	go func() {
-		time.Sleep(shutdownGraceTime)
-		for name, ps := range processes {
-			of.SystemOutput(fmt.Sprintf("sending SIGKILL to %s", name))
-			ps.Signal(syscall.SIGKILL)
-		}
-	}()
-}
diff --git a/darwin.go b/unix.go
similarity index 95%
rename from darwin.go
rename to unix.go
index 902ca76..55c8db6 100644
--- a/darwin.go
+++ b/unix.go
@@ -1,5 +1,7 @@
 package main
 
+// +build darwin freebsd linux netbsd openbsd
+
 import (
 	"fmt"
 	"os"
diff --git a/windows.go b/windows.go
index f7011b3..ee14e3b 100644
--- a/windows.go
+++ b/windows.go
@@ -1,5 +1,7 @@
 package main
 
+// +build windows
+
 import (
 	"fmt"
 	"os"