Index: src/lrx_proc.cc
--- src/lrx_proc.cc.orig
+++ src/lrx_proc.cc
@@ -19,11 +19,17 @@
 #include <lttoolbox/lt_locale.h>
 #include <lttoolbox/cli.h>
 #include <lttoolbox/file_utils.h>
+#include <iostream>
+#include <unistd.h>
 
 using namespace std;
 
 int main(int argc, char *argv[])
 {
+  if (pledge("stdio rpath wpath cpath", NULL) == -1) {
+    cerr << "pledge" << endl;
+  }
+
   LtLocale::tryToSetLocale();
   CLI cli("process a bilingual stream with a lexical rule transducer", PACKAGE_VERSION);
   cli.add_bool_arg('t', "trace", "trace rules which have been applied");
