How to set placeholder text in GtkEntry - c

Question

I tried this example:
#include <stdio.h>
#include <stdlib.h>
#include <gtk/gtk.h>
GdkPixbuf *create_pixbuf(const gchar * filename) {
GdkPixbuf *pixbuf;
GError *error = NULL;
pixbuf = gdk_pixbuf_new_from_file(filename, &error);
if(!pixbuf) {
fprintf(stderr, "%s\n", error->message); g_error_free(error);
}
return pixbuf;
}
void implement() {
printf("HI");
}
int main( int argc, char *argv[]) {
GtkWidget *window;
GtkWidget *frame;
GtkWidget *label;
GtkWidget *text;
gtk_init(&argc, &argv);
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(window), "New Message");
gtk_window_set_default_size(GTK_WINDOW(window), 310, 390);
gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
gtk_window_set_icon(GTK_WINDOW(window), create_pixbuf("web.png"));
frame = gtk_fixed_new();
gtk_container_add(GTK_CONTAINER(window), frame);
text = gtk_entry_new();
gtk_entry_set_max_length (GTK_ENTRY (text), 0);
gtk_entry_set_width_chars (GTK_ENTRY (text), 37);
gtk_entry_set_placeholder_text(GTK_ENTRY (text), "Send a message");
gtk_fixed_put(GTK_FIXED(frame), text, 2, 360);
gtk_widget_show_all(window);
g_signal_connect(window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
gtk_main();
return 0;
}
but getting error : undefined reference togtk_entry_set_placeholder_text'`

Answer 1

Make sure your GTK+ version is 3.2 or later, since that's when that particular function was added.