Fixed by installing gnome-menus.
This also fixes the empty "Installed Application" menu when right-clicking on a
file and selecting "Open with".
GNOME_KEYRING="gnome-keyring-2.32.1"
GNOME_ICON_THEME="gnome-icon-theme-3.4.0"
GNOME_MEDIA="gnome-media-2.32.0"
+GNOME_MENUS="gnome-menus-2.30.5"
GNUMERIC="gnumeric-1.10.17"
GNUPG="gnupg-1.4.12"
GNUTLS="gnutls-3.0.22"
ipkg ${MENU_CACHE}
ipkg ${GVFS}
ipkg ${XARCHIVER}
+ipkg ${GNOME_MENUS}
ipkg -m acnb ${LIBFM}
ipkg ${PCMANFM}
fpkg -m gnome ${GVFS}
fpkg -m sf -e "tar.bz2" ${XARCHIVER}
+
+fpkg -m gnome ${GNOME_MENUS}
fpkg -m sf -s "pcmanfm" -e "tar.gz" ${LIBFM}
fpkg -m sf ${PCMANFM}