I am trying to use make command to build. I am following this. I am compiling a code using GTK+2 and C language

hp@ubuntu:~/amhello$ make

make  all-recursive

make[1]: Entering directory `/home/hp/amhello'

Making all in src

make[2]: Entering directory `/home/hp/amhello/src'

gcc -DHAVE_CONFIG_H -I. -I..     -g -O2 -MT main.o -MD -MP -MF .deps/main.Tpo -c -o         main.o main.c

main.c:3:20: fatal error: gtk/gtk.h: No such file or directory

compilation terminated.

make[2]: *** [main.o] Error 1

make[2]: Leaving directory `/home/hp/amhello/src'

make[1]: *** [all-recursive] Error 1

make[1]: Leaving directory `/home/hp/amhello'

make: *** [all] Error 2

this is the main.c code

#include<config.h>

#include<stdio.h>

#include<gtk/gtk.h>

void static call(GtkWidget *widget,gpointer data) {

    g_print("%s 

",(gchar*) data);

}

int main(int agrc, char *agrv[]) {

    gtk_init(&agrc,&agrv);

    GtkWidget *window,*button;

    window=gtk_window_new(GTK_WINDOW_TOPLEVEL);

    g_signal_connect(window,"delete-event",G_CALLBACK(gtk_main_quit),NULL);

    gtk_window_set_title(GTK_WINDOW(window),"one button");

    button=gtk_button_new_with_label("hello world");

    g_signal_connect(button,"clicked",G_CALLBACK(call),(gpointer) "hello world");

    gtk_container_set_border_width(GTK_CONTAINER(window),10);

    gtk_container_add(GTK_CONTAINER(window),button);

    gtk_widget_show_all(window);

    gtk_main();

    return (0);

}