Index: apertium/apertium_extract_caps.cc
--- apertium/apertium_extract_caps.cc.orig
+++ apertium/apertium_extract_caps.cc
@@ -23,6 +23,7 @@
 #include <lttoolbox/string_utils.h>
 #include <lttoolbox/file_utils.h>
 #include <lttoolbox/cli.h>
+#include <unistd.h>
 
 #ifdef __MINGW32__
 #include <windows.h>
@@ -72,6 +73,11 @@ UString lemma_case(UStringView lu)
 
 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("Transfer capitalization information to word-bound blanks");
   cli.add_file_arg("input_file");
