Index: apertium/apertium_postchunk.cc
--- apertium/apertium_postchunk.cc.orig
+++ apertium/apertium_postchunk.cc
@@ -18,9 +18,16 @@
 #include <lttoolbox/lt_locale.h>
 #include <lttoolbox/cli.h>
 #include <lttoolbox/file_utils.h>
+#include <unistd.h>
 
 int main(int argc, char *argv[])
 {
+  if (pledge("stdio rpath wpath cpath", NULL) == -1)
+  {
+    wcerr << "pledge" << endl;
+    exit(EXIT_FAILURE);
+  }
+
   LtLocale::tryToSetLocale();
   CLI cli("process stream with postchunker");
   cli.add_file_arg("t3x", false);
