can't compile the library

[KDB2]

When trying to compile the library, I face this error:

Now type `make' to compile xapp
KDB@KDB-laptop ~/Sandbox/xapps $ make
make all-recursive
make[1]: Entering directory '/home/KDB/Sandbox/xapps'
Making all in libxapp
make[2]: Entering directory '/home/KDB/Sandbox/xapps/libxapp'
CC xapp-display.lo
xapp-display.c: In function 'create_blanking_window':
xapp-display.c:86:5: warning: 'gtk_widget_modify_bg' is deprecated (declared at /usr/include/gtk-3.0/gtk/deprecated/gtkstyle.h:753): Use 'gtk_widget_override_background_color' instead [-Wdeprecated-declarations]
gtk_widget_modify_bg(window, GTK_STATE_NORMAL, &color);
^
xapp-display.c: In function 'xapp_display_blank_other_monitors':
xapp-display.c:104:86: warning: passing argument 1 of 'gtk_widget_get_window' from incompatible pointer type
active_monitor = gdk_screen_get_monitor_at_window (screen, gtk_widget_get_window(window));
^
In file included from /usr/include/gtk-3.0/gtk/gtkapplication.h:27:0,
from /usr/include/gtk-3.0/gtk/gtkwindow.h:33,
from /usr/include/gtk-3.0/gtk/gtkdialog.h:33,
from /usr/include/gtk-3.0/gtk/gtkaboutdialog.h:30,
from /usr/include/gtk-3.0/gtk/gtk.h:31,
from xapp-display.c:9:
/usr/include/gtk-3.0/gtk/gtkwidget.h:927:23: note: expected 'struct GtkWidget ' but argument is of type 'struct GtkWindow *'
GdkWindow * gtk_widget_get_window (GtkWidget *widget);
^
xapp-display.c:108:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for (int i = 0; i < self->priv->num_outputs; i++)
^
xapp-display.c:108:5: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
xapp-display.c: In function 'xapp_display_unblank_monitors':
xapp-display.c:132:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for (int i = 0; i < self->priv->num_outputs; i++)
^
Makefile:549: recipe for target 'xapp-display.lo' failed
make[2]: ** [xapp-display.lo] Error 1
make[2]: Leaving directory '/home/KDB/Sandbox/xapps/libxapp'
Makefile:464: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/home/KDB/Sandbox/xapps'
Makefile:395: recipe for target 'all' failed
make: *** [all] Error 2

[JosephMcc]

Eh, thats my fault. I'm not on my normal machine right now but I'll fix it later.

[KDB2]

I think I have been lazy yesterday and could have fixed it without opening a bug. But at that time I had no idea what this error message meant. :)