Как скомпилировать Go код на Windows под Linux?

set GOOS=linux
set GOARCH=amd64
set CGO_CFLAGS=-g -O2 -w
set CGO_ENABLED=1
go build main.go constants.go functions.go

gcc_linux_amd64.c: In function '_cgo_sys_thread_start':
gcc_linux_amd64.c:62:2: error: unknown type name 'sigset_t'
  sigset_t ign, oset;
  ^

# runtime/cgo
_cgo_export.c:1:0: error: -fPIC ignored for target (all code is position 
independent) [-Werror]
 /* Created by cgo - DO NOT EDIT. */
 ^
cc1.exe: all warnings being treated as errors