Index: apertium/apertium_tmxbuild.cc
--- apertium/apertium_tmxbuild.cc.orig
+++ apertium/apertium_tmxbuild.cc
@@ -21,6 +21,7 @@
 #include <string>
 #include <cstdio>
 #include <lttoolbox/lt_locale.h>
+#include <unistd.h>
 
 #include <apertium/apertium_config.h>
 #include <apertium/tmx_builder.h>
@@ -61,6 +62,11 @@ void usage(char *progname)
 
 int main(int argc, char *argv[])
 {
+  if (pledge("stdio rpath wpath cpath", NULL) == -1) {
+    wcerr << L"pledge" << endl;
+    exit(EXIT_FAILURE);
+  }
+
   LtLocale::tryToSetLocale();
   string output_file = "";
   string doc1 = "", doc2 = "";