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>
 
 #ifdef __MINGW32__
 #include <windows.h>
@@ -98,6 +99,11 @@ readFullBlock(FILE *input, wchar_t const delim1, wchar
 int
 main (int argc, char** argv)
 {
+  if (pledge("stdio rpath wpath cpath", NULL) == -1) {
+    wcerr << "pledge" << endl;
+    exit(EXIT_FAILURE);
+  }
+
   wstring buf = L"";
   wstring blanktmp = L"";
   bool keepblank = false;