Index: lttoolbox/lt_tmxproc.cc
--- lttoolbox/lt_tmxproc.cc.orig
+++ lttoolbox/lt_tmxproc.cc
@@ -19,8 +19,16 @@
 #include <lttoolbox/cli.h>
 #include <lttoolbox/file_utils.h>
 
+#include <iostream>
+#include <unistd.h>
+
 int main(int argc, char *argv[])
 {
+  if (pledge("stdio rpath wpath cpath", NULL) == -1) {
+    std::cerr << "pledge" << std::endl;
+    return EXIT_FAILURE;
+  }
+
   LtLocale::tryToSetLocale();
   CLI cli("process a stream with a letter transducer");
   cli.add_file_arg("fst_file", false);
