diff --git a/libgo/go/internal/poll/errno_unix.go b/libgo/go/internal/poll/errno_unix.go
index 0b23fc3..922230b 100644
--- a/libgo/go/internal/poll/errno_unix.go
+++ b/libgo/go/internal/poll/errno_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd hurd linux netbsd openbsd solaris
 
 package poll
 
diff --git a/libgo/go/os/export_unix_test.go b/libgo/go/os/export_unix_test.go
index 032b1a9..3a15aad 100644
--- a/libgo/go/os/export_unix_test.go
+++ b/libgo/go/os/export_unix_test.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build aix darwin dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd hurd js,wasm linux nacl netbsd openbsd solaris
 
 package os
 
diff --git a/libgo/go/runtime/os_hurd.go b/libgo/go/runtime/os_hurd.go
index bb3e7ff..b3c6f80 100644
--- a/libgo/go/runtime/os_hurd.go
+++ b/libgo/go/runtime/os_hurd.go
@@ -112,7 +112,7 @@
 }
 
 func getncpu() int32 {
-	n := int32(sysconf(_SC_NPROCESSORS_ONLN))
+	n := int32(sysconf(__SC_NPROCESSORS_ONLN))
 	if n < 1 {
 		return 1
 	}
diff --git a/libgo/go/syscall/export_unix_test.go b/libgo/go/syscall/export_unix_test.go
index 120500c..dc11f45 100644
--- a/libgo/go/syscall/export_unix_test.go
+++ b/libgo/go/syscall/export_unix_test.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
+// +build aix darwin dragonfly freebsd hurd linux netbsd openbsd solaris
 
 package syscall