Kconfig options and make command line

I was trying to compile the file: drivers/staging/rtl8723au/core/rtw_ap.c but $ make drivers/staging/rtl8723au/core/rtw_ap.o doesn't work as there is no Makefile at core directory. Doing: $ make drivers/staging/rtl8723au/ doesn't work also as rtw_ap.c is only compiled under certain Kconfig conditions due this line at the Makefile: r8723au-$(CONFIG_8723AU_AP_MODE) += core/rtw_ap.o So is there a way to compile rtw_ap.o by just passing arguments to make? -- Peter