build differently for openbsd because we can't cross compile the process library

background_check.go

@@ -0,0 +1,14 @@
+// +build !openbsd
+
+package main
+
+import (
+	"github.com/shirou/gopsutil/process"
+)
+
+func checkProcess(currentPID int) (bool, error) {
+	myProc, _ := process.NewProcess(int32(currentPID))
+	bg, _ := myProc.Background()
+
+	return bg, nil
+}

background_check_openbsd.go

@@ -0,0 +1,10 @@
+package main
+
+import (
+	"fmt"
+)
+
+func openTTY() (packer.TTY, error) {
+	return false, fmt.Errorf("cannot determine if process is backgrounded in " +
+		"openbsd")
+}