diff --git a/cat.c b/cat.c
index 81a1eb4..dfe70c5 100644
--- a/cat.c
+++ b/cat.c
@@ -1,6 +1,7 @@
 /* See LICENSE file for copyright and license details. */
 #include <stdio.h>
 #include <stdlib.h>
+#include <getopt.h>
 #include <unistd.h>
 #include "util.h"
 
diff --git a/config.mk b/config.mk
index 4436e7b..c127425 100644
--- a/config.mk
+++ b/config.mk
@@ -2,7 +2,7 @@
 VERSION = 0.0
 
 #CC = cc
-CC = musl-gcc
+#CC = musl-gcc
 
 AR = ar
 
diff --git a/date.c b/date.c
index 9fb43a0..e7182d5 100644
--- a/date.c
+++ b/date.c
@@ -2,6 +2,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <time.h>
+#include <getopt.h>
 #include <unistd.h>
 #include "util.h"
 
diff --git a/echo.c b/echo.c
index fa45d8b..cf4dcd8 100644
--- a/echo.c
+++ b/echo.c
@@ -2,6 +2,7 @@
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <getopt.h>
 #include <unistd.h>
 
 int
diff --git a/grep.c b/grep.c
index 2645ef8..a66f8d4 100644
--- a/grep.c
+++ b/grep.c
@@ -2,6 +2,7 @@
 #include <regex.h>
 #include <stdbool.h>
 #include <stdio.h>
+#include <getopt.h>
 #include <stdlib.h>
 #include <unistd.h>
 
diff --git a/ln.c b/ln.c
index e61bb7c..35ad7d5 100644
--- a/ln.c
+++ b/ln.c
@@ -2,6 +2,7 @@
 #include <stdbool.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <getopt.h>
 #include "util.h"
 
 int
diff --git a/rm.c b/rm.c
index fe6e2ce..e3ca462 100644
--- a/rm.c
+++ b/rm.c
@@ -5,6 +5,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <getopt.h>
 #include <unistd.h>
 #include "util.h"
 
diff --git a/sleep.c b/sleep.c
index 39fbae8..607653c 100644
--- a/sleep.c
+++ b/sleep.c
@@ -1,6 +1,7 @@
 /* See LICENSE file for copyright and license details. */
 #include <stdlib.h>
 #include <unistd.h>
+#include <getopt.h>
 #include "util.h"
 
 int
diff --git a/tee.c b/tee.c
index 3322d02..81baff2 100644
--- a/tee.c
+++ b/tee.c
@@ -3,6 +3,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <getopt.h>
 #include "util.h"
 
 int
diff --git a/touch.c b/touch.c
index 4f0cfbf..b8b82ac 100644
--- a/touch.c
+++ b/touch.c
@@ -3,6 +3,7 @@
 #include <fcntl.h>
 #include <stdbool.h>
 #include <stdlib.h>
+#include <getopt.h>
 #include <time.h>
 #include <unistd.h>
 #include <utime.h>
diff --git a/wc.c b/wc.c
index 49979c9..a783d8b 100644
--- a/wc.c
+++ b/wc.c
@@ -3,6 +3,7 @@
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <getopt.h>
 #include <unistd.h>
 #include "util.h"