From 63d16098f02931896cafd16de6570186229906fa Mon Sep 17 00:00:00 2001
From: Fazlul Shahriar <fshahriar@gmail.com>
Date: Fri, 31 Jul 2020 14:25:07 -0400
Subject: [PATCH] Fix build on Plan 9

---
 cli/error_plan9.go | 15 +++++++++++++++
 cli/error_posix.go |  2 +-
 2 files changed, 16 insertions(+), 1 deletion(-)
 create mode 100644 cli/error_plan9.go

diff --git a/cli/error_plan9.go b/cli/error_plan9.go
new file mode 100644
index 0000000..aa04fe3
--- /dev/null
+++ b/cli/error_plan9.go
@@ -0,0 +1,15 @@
+package cli
+
+import "syscall"
+
+func isErrnoNotSupported(err error) bool {
+	switch err {
+	case
+		// Operation not supported
+		syscall.EINVAL, syscall.EPLAN9,
+		// Sync on os.Stdin or os.Stderr returns "permission denied".
+		syscall.EPERM:
+		return true
+	}
+	return false
+}
diff --git a/cli/error_posix.go b/cli/error_posix.go
index d2d6b2b..7ab4416 100644
--- a/cli/error_posix.go
+++ b/cli/error_posix.go
@@ -1,4 +1,4 @@
-//+build !windows
+//+build !windows,!plan9
 
 package cli
 
-- 
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