diff --git a/Makefile b/Makefile
index 9ecbedb..1de9fa4 100644
--- a/Makefile
+++ b/Makefile
@@ -18,7 +18,7 @@ PREFIX ?= /usr/local
 
 MANDIR != [ $(PREFIX) = / ] && printf '/usr/share/man\n' \
 	|| printf '/share/man\n'
-SYSEXITS != printf '\043include <sysexits.h>\n' | cpp -M - | sed 's/ /\n/g' \
+SYSEXITS != printf '\043include <sysexits.h>\n' | cpp -M - | tr ' ' '\n' \
 	| sed -n 's/sysexits\.h//p' || printf 'include\n'
 
 CC ?= cc
@@ -113,7 +113,7 @@ build/bin/mm: src/mm.c build
 .PHONY: npc
 npc: build/bin/npc
 build/bin/npc: src/npc.c build
-	$(CC) $(CFLAGAS) -o $@ src/npc.c
+	$(CC) $(CFLAGS) -o $@ src/npc.c
 
 .PHONY: rpn
 rpn: build/bin/rpn
@@ -138,9 +138,7 @@ build/bin/strcmp: src/strcmp.c build
 .PHONY: swab
 swab: build/bin/swab
 build/bin/swab: src/swab.rs build build/o/libsysexits.rlib
-	$(RUSTC) $(RUSTFLAGS) --extern getopt=build/o/libgetopt.rlib \
-		--extern sysexits=build/o/libsysexits.rlib \
-		-o $@ src/swab.rs
+	$(RUSTC) $(RUSTFLAGS) $(RUSTLIBS) -o $@ src/swab.rs
 
 .PHONY: true
 true: build/bin/true
diff --git a/src/dj.c b/src/dj.c
index 8a6732c..8fc4a44 100644
--- a/src/dj.c
+++ b/src/dj.c
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2024 DTB <trinity@trinity.moe>
+ * Copyright (c) 2024 Emma Tebibyte <emma@tebibyte.media>
  * SPDX-License-Identifier: AGPL-3.0-or-later
  *
  * This program is free software: you can redistribute it and/or modify it under
@@ -22,6 +23,7 @@
 #include <stdio.h> /* fprintf(3), stderr */
 #include <stdlib.h> /* free(3), malloc(3), strtol(3), size_t */
 #include <string.h> /* memcpy(3), memmove(3), memset(3) */
+#include <sys/stat.h> /* S_IRUSR, S_IWUSR, S_IRGRP, S_IWGRP, S_IROTH, S_IWOTH */
 #include <sysexits.h> /* EX_OK, EX_USAGE */
 #include <unistd.h> /* close(2), getopt(3), lseek(2), read(2), write(2),
                      * optarg, optind, STDIN_FILENO, STDOUT_FILENO */