diff --git a/sys/modules/dpt/Makefile b/sys/modules/dpt/Makefile
index 21b3b08ea397..ee588adb829f 100644
--- a/sys/modules/dpt/Makefile
+++ b/sys/modules/dpt/Makefile
@@ -11,24 +11,6 @@ SRCS=	dpt_scsi.c dpt.h \
 	opt_cam.h opt_scsi.h \
 	device_if.h bus_if.h
 
-.if ${MK_EISA} == "no"
-# Create an empty opt_eisa.h in order to keep kmod.mk from linking in an
-# existing one from KERNBUILDDIR which possibly has DEV_EISA defined so
-# dpt.ko is always built without EISA support.
-opt_eisa.h:
-	:> ${.TARGET}
-.else
-.if !defined(KERNBUILDDIR)
-SRCS+=	dpt_eisa.c eisa_if.h
-
-opt_eisa.h:
-	echo "#define DEV_EISA 1" > ${.TARGET}
-.else
-DEV_EISA!= sed -n '/DEV_EISA/p' ${KERNBUILDDIR}/opt_eisa.h
-.if !empty(DEV_EISA)
-SRCS+=	dpt_eisa.c eisa_if.h
-.endif
-.endif
-.endif
+SRCS.DEV_EISA=	dpt_eisa.c eisa_if.h
 
 .include <bsd.kmod.mk>
diff --git a/sys/modules/ed/Makefile b/sys/modules/ed/Makefile
index 723df349904a..427b99f973cd 100644
--- a/sys/modules/ed/Makefile
+++ b/sys/modules/ed/Makefile
@@ -8,10 +8,13 @@ SRCS+=	if_ed_novell.c if_ed_wd80x3.c if_ed_rtl80x9.c isa_if.h
 .if ${MACHINE} == "pc98"
 SRCS+=	if_ed_cbus.c
 .else
-SRCS+=	if_ed_isa.c if_ed_3c503.c if_ed_hpp.c if_ed_sic.c
+SRCS+=	if_ed_isa.c
+SRCS.ED_HPP=if_ed_hpp.c
+SRCS.ED_SIC=if_ed_sic.c
+SRCS.ED_3C503=if_ed_3c503.c
 .endif
 SRCS+=	if_ed_pccard.c pccarddevs.h card_if.h
-SRCS+=	if_ed_pci.c pci_if.h
+SRCS.DEV_PCI=if_ed_pci.c pci_if.h
 
 SRCS+=	opt_ed.h bus_if.h device_if.h miibus_if.h
 
diff --git a/sys/modules/ep/Makefile b/sys/modules/ep/Makefile
index 9f1dbee23a6d..df117abe8b9d 100644
--- a/sys/modules/ep/Makefile
+++ b/sys/modules/ep/Makefile
@@ -9,10 +9,7 @@ KMOD=	if_ep
 SRCS=	if_ep.c
 SRCS+=	if_ep_pccard.c pccarddevs.h card_if.h
 SRCS+=	if_ep_isa.c isa_if.h
-.if ${MK_EISA} != "no"
-SRCS+=	if_ep_eisa.c eisa_if.h
-.endif
-#SRCS+=	if_ep_mca.c
+SRCS.DEV_EISA=	if_ep_eisa.c eisa_if.h
 SRCS+=	bus_if.h device_if.h
 
 .include <bsd.kmod.mk>
diff --git a/sys/modules/si/Makefile b/sys/modules/si/Makefile
index df5361f26e8e..d2d436fdd569 100644
--- a/sys/modules/si/Makefile
+++ b/sys/modules/si/Makefile
@@ -3,8 +3,9 @@
 .PATH: ${.CURDIR}/../../dev/si
 
 KMOD=	si
-SRCS=	si.c si2_z280.c si3_t225.c si_eisa.c si_isa.c si_pci.c
-SRCS+=	bus_if.h device_if.h eisa_if.h isa_if.h pci_if.h
+SRCS=	si.c si2_z280.c si3_t225.c si_isa.c si_pci.c
+SRCS+=	bus_if.h device_if.h isa_if.h pci_if.h
 SRCS+=	opt_compat.h opt_debug_si.h opt_eisa.h
+SRCS.DEV_EISA=si_eisa.c eisa_if.h
 
 .include <bsd.kmod.mk>
diff --git a/sys/modules/vx/Makefile b/sys/modules/vx/Makefile
index 6012429fb023..2086dc8bf694 100644
--- a/sys/modules/vx/Makefile
+++ b/sys/modules/vx/Makefile
@@ -7,9 +7,7 @@ SYSDIR?=${.CURDIR}/../..
 
 KMOD=	if_vx
 SRCS=	if_vx.c if_vx_pci.c
-.if ${MK_EISA} != "no"
-SRCS+=	if_vx_eisa.c
-.endif
-SRCS+=	device_if.h bus_if.h pci_if.h eisa_if.h
+SRCS.DEV_EISA=	if_vx_eisa.c eisa_if.h
+SRCS+=	device_if.h bus_if.h pci_if.h
 
 .include <bsd.kmod.mk>