build a simple gcc,got error:gtk/gtk.h: No such file or directory

[gnosy]

my foo.c:
#include <gtk/gtk.h>
int main(int argc, char *argv[]) {
    GtkWidget *window;
    gtk_init(&argc, &argv);
    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW(window), "hello");
    gtk_widget_show(window);
    gtk_main();
    return 0;
}
error:
C:\msys\1.0\home\Administrator\foo.c|1|gtk/gtk.h: No such file or directory|
C:\msys\1.0\home\Administrator\foo.c||In function `main':|
C:\msys\1.0\home\Administrator\foo.c|3|error: `GtkWidget' undeclared (first use in this function)|
C:\msys\1.0\home\Administrator\foo.c|3|error: (Each undeclared identifier is reported only once|
C:\msys\1.0\home\Administrator\foo.c|3|error: for each function it appears in.)|
C:\msys\1.0\home\Administrator\foo.c|3|error: `window' undeclared (first use in this function)|
C:\msys\1.0\home\Administrator\foo.c|5|error: `GTK_WINDOW_TOPLEVEL' undeclared (first use in this function)|
||=== Build finished: 6 errors, 0 warnings ===|

thanks in advance!
gnosy

[Ceniza]

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[stahta01]

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Tim S.