diff --git a/gpio/dht11.c b/gpio/dht11.c
index 62c3a34..3f77d79 100644
--- a/gpio/dht11.c
+++ b/gpio/dht11.c
@@ -9,6 +9,8 @@
 #include <stdlib.h>
 #include <stdint.h>
 #include <unistd.h>
+#include <ctype.h>
+
 #define MAX_TIME 85
 #define MAX_TRIES 100
 
diff --git a/gpio/dht12.c b/gpio/dht12.c
index 5bcede9..a2c5211 100644
--- a/gpio/dht12.c
+++ b/gpio/dht12.c
@@ -8,6 +8,7 @@
 #include <stdlib.h>
 #include <stdint.h>
 #include <string.h>
+#include <ctype.h>
 
 #define MAX_TIMINGS	85
 
diff --git a/gpio/helement.c b/gpio/helement.c
index 6c35a1c..37c2c25 100644
--- a/gpio/helement.c
+++ b/gpio/helement.c
@@ -8,6 +8,7 @@
 #include <stdlib.h>
 #include <stdbool.h>
 #include <string.h>
+#include <ctype.h>
 
 static int is_num(char *str)
 {
diff --git a/gpio/infrared.c b/gpio/infrared.c
index 6dee74d..372cdc6 100644
--- a/gpio/infrared.c
+++ b/gpio/infrared.c
@@ -8,6 +8,7 @@
 #include <stdlib.h>
 #include <stdbool.h>
 #include <string.h>
+#include <ctype.h>
 
 static int is_num(char *str)
 {
diff --git a/gpio/light.c b/gpio/light.c
index 4ad1a16..f8833f2 100644
--- a/gpio/light.c
+++ b/gpio/light.c
@@ -7,7 +7,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <type.h>
+//#include <linux/type.h>
 #include <ctype.h>
 
 
diff --git a/gpio/pin.c b/gpio/pin.c
index 58619ba..539ca85 100644
--- a/gpio/pin.c
+++ b/gpio/pin.c
@@ -7,6 +7,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <ctype.h>
 
 static int is_num(char *str)
 {
diff --git a/gpio/sound.c b/gpio/sound.c
index add81e9..7fbb396 100644
--- a/gpio/sound.c
+++ b/gpio/sound.c
@@ -8,6 +8,7 @@
 #include <stdlib.h>
 #include <stdbool.h>
 #include <string.h>
+#include <ctype.h>
 
 static int is_num(char *str)
 {
diff --git a/gpio/ultrasound.c b/gpio/ultrasound.c
index b13ca3e..baa3827 100644
--- a/gpio/ultrasound.c
+++ b/gpio/ultrasound.c
@@ -8,6 +8,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <ctype.h>
 
 static int is_num(char *str)
 {