Index: lttoolbox/lt_trim.cc
--- lttoolbox/lt_trim.cc.orig
+++ lttoolbox/lt_trim.cc
@@ -19,6 +19,7 @@
 #include <lttoolbox/cli.h>
 #include <lttoolbox/lt_locale.h>
 #include <iostream>
+#include <unistd.h>
 
 void
 trim(FILE* file_mono, FILE* file_bi, FILE* file_out, std::set<UString> match_sections)
@@ -102,6 +103,11 @@ trim(FILE* file_mono, FILE* file_bi, FILE* file_out, s
 
 int main(int argc, char *argv[])
 {
+  if (pledge("stdio rpath wpath cpath", NULL) == -1) {
+    std::cerr << "pledge" << std::endl;
+    exit(EXIT_FAILURE);
+  }
+
   LtLocale::tryToSetLocale();
   CLI cli("trim a transducer to another transducer", PACKAGE_VERSION);
   cli.add_file_arg("analyser_bin_file", false);
