diff --git a/src/syscall/syscall_linux.go b/src/syscall/syscall_linux.go
new file mode 100644
index 00000000..58778f4b
--- /dev/null
+++ b/src/syscall/syscall_linux.go
@@ -0,0 +1,8 @@
+package syscall
+
+func Setuid(code int) (err error)
+func Setgid(code int) (err error)
+func Setreuid(ruid, euid int) (err error)
+func Setregid(rgid, egid int) (err error)
+func Setresuid(ruid, euid, suid int) (err error)
+func Setresgid(rgid, egid, sgid int) (err error)
diff --git a/src/syscall/syscall_unix.go b/src/syscall/syscall_unix.go
new file mode 100644
index 00000000..0cd8f286
--- /dev/null
+++ b/src/syscall/syscall_unix.go
@@ -0,0 +1,3 @@
+package syscall
+
+func Exec(argv0 string, argv []string, envv []string) (err error)