Index: lttoolbox/lt_expand.cc
--- lttoolbox/lt_expand.cc.orig
+++ lttoolbox/lt_expand.cc
@@ -22,6 +22,7 @@
 #include <libgen.h>
 #include <string>
 #include <getopt.h>
+#include <unistd.h>
 
 #ifdef _MSC_VER
 #include <io.h>
@@ -55,6 +56,11 @@ void endProgram(char *name)
 
 int main(int argc, char *argv[])
 {
+  if (pledge("stdio rpath wpath cpath", NULL) == -1) {
+    wcerr << "pledge" << endl;
+    exit(EXIT_FAILURE);
+  }
+
   FILE *input = NULL, *output = NULL;
   Expander e;
   e.setKeepBoundaries(false);