Index: apertium/apertium_cleanstream.cc
--- apertium/apertium_cleanstream.cc.orig
+++ apertium/apertium_cleanstream.cc
@@ -22,6 +22,7 @@
 #include <iostream>
 #include <cstdio>
 #include <list>
+#include <unistd.h>
 #include <lttoolbox/ustring.h>
 #include <lttoolbox/lt_locale.h>
 #include <lttoolbox/input_file.h>
@@ -35,6 +36,10 @@ using namespace std;
 int
 main (int argc, char** argv)
 {
+  if(pledge("stdio rpath wpath cpath", NULL) == -1) {
+    cerr << "pledge" << endl;
+    return 1;
+  }
   UString buf;
   UString blanktmp;
   bool keepblank = false;
