Index: apertium/wblank-mode.cc
--- apertium/wblank-mode.cc.orig
+++ apertium/wblank-mode.cc
@@ -23,6 +23,7 @@
 #include <regex>
 #include <cctype>
 #include "apertium_config.h"
+#include <unistd.h>
 
 void trim(std::string& str) {
 	while (!str.empty() && isspace(str.back())) {
@@ -35,6 +36,11 @@ void trim(std::string& str) {
 }
 
 int main(int argc, char* argv[]) {
+	if (pledge("stdio rpath wpath cpath", NULL) == -1) {
+		std::cerr << "pledge" << std::endl;
+		return 1;
+	}
+
 	bool add_z = false;
 
 	if (argc > 1 && argv[1][0] == '-' && argv[1][1] == 'z' && argv[1][2] == 0) {