src/java.base/unix/native/libnet/DefaultProxySelector.c:378:41: error: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]
    proxies = (*g_proxy_resolver_lookup)(resolver, uri, NULL, &error);
                                        ^
src/java.base/unix/native/libnet/DefaultProxySelector.c:397:63: error: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]
                                (*g_network_address_parse_uri)(proxies[i], 0,
                                                              ^
src/java.base/unix/native/libnet/DefaultProxySelector.c:402:70: error: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]
                            phost = (*g_network_address_get_hostname)(conn);
                                                                     ^
src/java.base/unix/native/libnet/DefaultProxySelector.c:403:66: error: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]
                            pport = (*g_network_address_get_port)(conn);
                                                                 ^
src/java.base/unix/native/libnet/DefaultProxySelector.c:445:22: error: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]
        (*g_strfreev)(proxies);
                     ^
src/java.base/unix/native/libnet/DefaultProxySelector.c:448:25: error: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]
        (*g_clear_error)(&error);
                        ^
Compiling X11Renderer.c (for libawt_headless.so)
In file included from src/java.desktop/unix/native/common/java2d/x11/X11PMBlitLoops.c:29:
In file included from src/java.desktop/unix/native/common/java2d/x11/X11SurfaceData.h:29:
src/java.desktop/unix/native/common/awt/awt_GraphicsEnv.h:53:12: error: a function declaration without a prototype is deprecated in all versions of C and is treated as a zero-parameter prototype in C2x, conflicting with a previous declaration [-Werror,-Wdeprecated-non-prototype]
extern int XShmQueryExtension();
           ^
/usr/include/X11/extensions/XShm.h:59:6: note: conflicting prototype is here
Bool XShmQueryExtension(
     ^
src/java.desktop/unix/native/libawt_xawt/awt/gtk2_interface.c:1468:43: error: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]
                    (*fp_gtk_notebook_new)(NULL);
                                          ^
src/java.desktop/unix/native/libawt_xawt/awt/gtk2_interface.c:1476:48: error: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]
                    (*fp_gtk_toggle_button_new)(NULL);
                                               ^
src/java.desktop/unix/native/libawt_xawt/awt/gtk2_interface.c:1485:42: error: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]
                    (*fp_gtk_toolbar_new)(NULL);
                                         ^
src/java.desktop/unix/native/libawt_xawt/awt/gtk3_interface.c:1255:43: error: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]
                    (*fp_gtk_notebook_new)(NULL);
                                          ^
src/java.desktop/unix/native/libawt_xawt/awt/gtk3_interface.c:1263:48: error: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]
                    (*fp_gtk_toggle_button_new)(NULL);
                                               ^
src/java.desktop/unix/native/libawt_xawt/awt/gtk3_interface.c:1272:42: error: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]
                    (*fp_gtk_toolbar_new)(NULL);
                                         ^