Index: apertium/apertium_compile_caps.cc
--- apertium/apertium_compile_caps.cc.orig
+++ apertium/apertium_compile_caps.cc
@@ -19,9 +19,15 @@
 #include <lttoolbox/cli.h>
 #include <lttoolbox/file_utils.h>
 #include <lttoolbox/lt_locale.h>
+#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("compile capitalization restoration rules");
   cli.add_bool_arg('h', "help", "print this message and exit");
