Build failure: undefined reference in src/main.c

In master, the following lines in src/main.c break the build for me:

#ifdef ENABLE_DESKTOP_ICONS
    xfdesktop_monitor_chooser_ui_register_resource();
#endif

Error:

main.c:(.text.startup+0x20): undefined reference to `xfdesktop_monitor_chooser_ui_register_resource'
collect2: error: ld returned 1 exit status