diff --git a/conf.d/Makefile b/conf.d/Makefile
index 374bfdb7..817f60e2 100644
--- a/conf.d/Makefile
+++ b/conf.d/Makefile
@@ -6,7 +6,16 @@ CLEANFILES+=	network staticroute
 
 MK=	../mk
 include ${MK}/os.mk
-include Makefile.${OS}
+
+ifeq ($(OS),FreeBSD)
+CONF+=	ipfw moused powerd rarpd savecore syscons
+else ifeq ($(OS),Linux)
+CONF+=	consolefont dmesg hwclock keymaps killprocs modules
+SOS=	Linux
+else ifeq ($(OS),NetBSD)
+CONF+=	moused rarpd savecore
+endif
+
 include ${MK}/scripts.mk
 
 SOS?=	BSD
diff --git a/conf.d/Makefile.FreeBSD b/conf.d/Makefile.FreeBSD
deleted file mode 100644
index c43a1d4f..00000000
--- a/conf.d/Makefile.FreeBSD
+++ /dev/null
@@ -1 +0,0 @@
-CONF+=	ipfw moused powerd rarpd savecore syscons
diff --git a/conf.d/Makefile.Linux b/conf.d/Makefile.Linux
deleted file mode 100644
index 369b3dff..00000000
--- a/conf.d/Makefile.Linux
+++ /dev/null
@@ -1,2 +0,0 @@
-CONF+=	consolefont dmesg hwclock keymaps killprocs modules
-SOS=	Linux
diff --git a/conf.d/Makefile.NetBSD b/conf.d/Makefile.NetBSD
deleted file mode 100644
index 18a52cce..00000000
--- a/conf.d/Makefile.NetBSD
+++ /dev/null
@@ -1 +0,0 @@
-CONF+=	moused rarpd savecore
diff --git a/doc/Makefile b/doc/Makefile
index b4dd962b..8f6930a2 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -3,5 +3,25 @@ INC=	net.example
 
 MK=	../mk
 include ${MK}/os.mk
-include Makefile.${OS}
+
+ifeq ($(OS),FreeBSD)
+SRCS+=		net.example.in
+
+.SUFFIXES:	.BSD.in
+.BSD.in:
+	${CP} $< $@
+else ifeq ($(OS),Linux)
+SRCS+=		net.example.in
+
+.SUFFIXES:	.Linux.in
+.Linux.in:
+	${CP} $< $@
+else ifeq ($(OS),NetBSD)
+SRCS+=		net.example.in
+
+.SUFFIXES:	.BSD.in
+.BSD.in:
+	${CP} $< $@
+endif
+
 include ${MK}/scripts.mk
diff --git a/doc/Makefile.FreeBSD b/doc/Makefile.FreeBSD
deleted file mode 100644
index a21536b1..00000000
--- a/doc/Makefile.FreeBSD
+++ /dev/null
@@ -1,5 +0,0 @@
-SRCS+=		net.example.in
-
-.SUFFIXES:	.BSD.in
-.BSD.in:
-	${CP} $< $@
diff --git a/doc/Makefile.Linux b/doc/Makefile.Linux
deleted file mode 100644
index 405f7ea9..00000000
--- a/doc/Makefile.Linux
+++ /dev/null
@@ -1,5 +0,0 @@
-SRCS+=		net.example.in
-
-.SUFFIXES:	.Linux.in
-.Linux.in:
-	${CP} $< $@
diff --git a/doc/Makefile.NetBSD b/doc/Makefile.NetBSD
deleted file mode 100644
index a21536b1..00000000
--- a/doc/Makefile.NetBSD
+++ /dev/null
@@ -1,5 +0,0 @@
-SRCS+=		net.example.in
-
-.SUFFIXES:	.BSD.in
-.BSD.in:
-	${CP} $< $@
diff --git a/etc/Makefile b/etc/Makefile
index 314225a8..4f913add 100644
--- a/etc/Makefile
+++ b/etc/Makefile
@@ -5,7 +5,21 @@ CLEANFILES+=	rc.conf
 
 MK=	../mk
 include ${MK}/os.mk
-include Makefile.${OS}
+
+ifeq ($(OS),FreeBSD)
+SED_EXTRA=	-e 's:@TERM@:cons25:g'
+SRCS+=		rc.conf.in rc.in rc.shutdown.in
+CONF+=		devd.conf
+BIN+=		rc rc.shutdown rc.devd
+else ifeq ($(OS),Linux)
+SED_EXTRA=	-e 's:@TERM@:wsvt25:g'
+SRCS+=		rc.conf.in rc.in rc.shutdown.in
+else ifeq ($(OS),NetBSD)
+SED_EXTRA=	-e 's:@TERM@:wsvt25:g'
+SRCS+=		rc.conf.in rc.in rc.shutdown.in
+BIN+=		rc rc.shutdown
+endif
+
 include ${MK}/scripts.mk
 
 # We can't use "ifndef" here because that treats set-but-empty
diff --git a/etc/Makefile.FreeBSD b/etc/Makefile.FreeBSD
deleted file mode 100644
index 6de74510..00000000
--- a/etc/Makefile.FreeBSD
+++ /dev/null
@@ -1,4 +0,0 @@
-SED_EXTRA=	-e 's:@TERM@:cons25:g'
-SRCS+=		rc.conf.in rc.in rc.shutdown.in
-CONF+=		devd.conf
-BIN+=		rc rc.shutdown rc.devd
diff --git a/etc/Makefile.Linux b/etc/Makefile.Linux
deleted file mode 100644
index 5b562947..00000000
--- a/etc/Makefile.Linux
+++ /dev/null
@@ -1,2 +0,0 @@
-SED_EXTRA=	-e 's:@TERM@:wsvt25:g'
-SRCS+=		rc.conf.in rc.in rc.shutdown.in
diff --git a/etc/Makefile.NetBSD b/etc/Makefile.NetBSD
deleted file mode 100644
index 0e85dd4e..00000000
--- a/etc/Makefile.NetBSD
+++ /dev/null
@@ -1,3 +0,0 @@
-SED_EXTRA=	-e 's:@TERM@:wsvt25:g'
-SRCS+=		rc.conf.in rc.in rc.shutdown.in
-BIN+=		rc rc.shutdown
diff --git a/init.d.misc/Makefile b/init.d.misc/Makefile
index 2b2a51ba..b44063cc 100644
--- a/init.d.misc/Makefile
+++ b/init.d.misc/Makefile
@@ -8,4 +8,11 @@ MK=	../mk
 SED_EXTRA+= -e 's:@VARBASE@:/var:g'
 
 include ${MK}/scripts.mk
-include Makefile.${OS}
+
+ifeq ($(OS),FreeBSD)
+PKG_PREFIX?=	/usr/local
+else ifeq ($(OS),Linux)
+PKG_PREFIX?=/usr
+else ifeq ($(OS),NetBSD)
+PKG_PREFIX?=	/usr/pkg
+endif
diff --git a/init.d.misc/Makefile.FreeBSD b/init.d.misc/Makefile.FreeBSD
deleted file mode 100644
index 031049d2..00000000
--- a/init.d.misc/Makefile.FreeBSD
+++ /dev/null
@@ -1 +0,0 @@
-PKG_PREFIX?=	/usr/local
diff --git a/init.d.misc/Makefile.Linux b/init.d.misc/Makefile.Linux
deleted file mode 100644
index e280d766..00000000
--- a/init.d.misc/Makefile.Linux
+++ /dev/null
@@ -1 +0,0 @@
-PKG_PREFIX?=/usr
diff --git a/init.d.misc/Makefile.NetBSD b/init.d.misc/Makefile.NetBSD
deleted file mode 100644
index 73fc2b7d..00000000
--- a/init.d.misc/Makefile.NetBSD
+++ /dev/null
@@ -1 +0,0 @@
-PKG_PREFIX?=	/usr/pkg
diff --git a/init.d/Makefile b/init.d/Makefile
index b7490d38..5fd33310 100644
--- a/init.d/Makefile
+++ b/init.d/Makefile
@@ -16,7 +16,46 @@ TARGETS+=	${_NET_LO}
 
 MK=	../mk
 include ${MK}/os.mk
-include Makefile.${OS}
+
+ifeq ($(OS),FreeBSD)
+NET_LO=	net.lo0
+
+# Generic BSD scripts
+SRCS+=	hostid.in moused.in newsyslog.in pf.in rarpd.in rc-enabled.in \
+	rpcbind.in savecore.in syslogd.in
+
+# These are FreeBSD specific
+SRCS+=	adjkerntz.in devd.in dumpon.in ipfw.in mixer.in nscd.in \
+	powerd.in syscons.in
+
+.SUFFIXES:	.BSD.in
+.BSD.in:
+	sed ${SED_REPLACE} ${SED_EXTRA} $< > $@
+else ifeq ($(OS),Linux)
+NET_LO=	net.lo
+
+SRCS+=	devfs.in dmesg.in hwclock.in consolefont.in keymaps.in killprocs.in \
+	modules.in mount-ro.in mtab.in numlock.in procfs.in sysfs.in \
+	termencoding.in
+
+.SUFFIXES:	.Linux.in
+.Linux.in:
+	sed ${SED_REPLACE} ${SED_EXTRA} $< > $@
+else ifeq ($(OS),NetBSD)
+NET_LO=	net.lo0
+
+# Generic BSD scripts
+SRCS+=	hostid.in moused.in newsyslog.in pf.in rarpd.in rc-enabled.in \
+	rpcbind.in savecore.in syslogd.in
+
+# These are NetBSD specific
+SRCS+=	devdb.in swap-blk.in ttys.in wscons.in
+
+.SUFFIXES:	.BSD.in
+.BSD.in:
+	sed ${SED_REPLACE} ${SED_EXTRA} $< > $@
+endif
+
 include ${MK}/scripts.mk
 
 _installafter_: realinstall
diff --git a/init.d/Makefile.FreeBSD b/init.d/Makefile.FreeBSD
deleted file mode 100644
index 3cd6feb6..00000000
--- a/init.d/Makefile.FreeBSD
+++ /dev/null
@@ -1,13 +0,0 @@
-NET_LO=	net.lo0
-
-# Generic BSD scripts
-SRCS+=	hostid.in moused.in newsyslog.in pf.in rarpd.in rc-enabled.in \
-	rpcbind.in savecore.in syslogd.in
-
-# These are FreeBSD specific
-SRCS+=	adjkerntz.in devd.in dumpon.in ipfw.in mixer.in nscd.in \
-	powerd.in syscons.in
-
-.SUFFIXES:	.BSD.in
-.BSD.in:
-	sed ${SED_REPLACE} ${SED_EXTRA} $< > $@
diff --git a/init.d/Makefile.Linux b/init.d/Makefile.Linux
deleted file mode 100644
index 5e574264..00000000
--- a/init.d/Makefile.Linux
+++ /dev/null
@@ -1,9 +0,0 @@
-NET_LO=	net.lo
-
-SRCS+=	devfs.in dmesg.in hwclock.in consolefont.in keymaps.in killprocs.in \
-	modules.in mount-ro.in mtab.in numlock.in procfs.in sysfs.in \
-	termencoding.in
-
-.SUFFIXES:	.Linux.in
-.Linux.in:
-	sed ${SED_REPLACE} ${SED_EXTRA} $< > $@
diff --git a/init.d/Makefile.NetBSD b/init.d/Makefile.NetBSD
deleted file mode 100644
index 60fd09c2..00000000
--- a/init.d/Makefile.NetBSD
+++ /dev/null
@@ -1,12 +0,0 @@
-NET_LO=	net.lo0
-
-# Generic BSD scripts
-SRCS+=	hostid.in moused.in newsyslog.in pf.in rarpd.in rc-enabled.in \
-	rpcbind.in savecore.in syslogd.in
-
-# These are NetBSD specific
-SRCS+=	devdb.in swap-blk.in ttys.in wscons.in
-
-.SUFFIXES:	.BSD.in
-.BSD.in:
-	sed ${SED_REPLACE} ${SED_EXTRA} $< > $@
diff --git a/net/Makefile b/net/Makefile
index 5cba7eb0..af5f6e2e 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -5,5 +5,30 @@ INC=	dhclient.sh dhcpcd.sh ifconfig.sh macchanger.sh macnet.sh \
 
 MK=	../mk
 include ${MK}/os.mk
-include Makefile.${OS}
+
+ifeq ($(OS),FreeBSD)
+SRCS+=		iwconfig.sh.in
+INC+=		iwconfig.sh
+
+.SUFFIXES:	.sh.BSD.in
+.sh.BSD.in.sh:
+	${CP} $< $@
+else ifeq ($(OS),Linux)
+SRCS+=		iwconfig.sh.in
+INC+=		adsl.sh apipa.sh arping.sh bonding.sh br2684ctl.sh bridge.sh \
+		ccwgroup.sh clip.sh ethtool.sh iproute2.sh ifplugd.sh ip6to4.sh \
+		ipppd.sh iwconfig.sh netplugd.sh pppd.sh pump.sh tuntap.sh udhcpc.sh \
+		vlan.sh
+
+.SUFFIXES:	.sh.Linux.in
+.sh.Linux.in.sh:
+	${CP} $< $@
+else ifeq ($(OS),NetBSD)
+INC+=		ifwatchd.sh
+
+.SUFFIXES:	.sh.BSD.in
+.sh.BSD.in.sh:
+	${CP} $< $@
+endif
+
 include ${MK}/scripts.mk
diff --git a/net/Makefile.FreeBSD b/net/Makefile.FreeBSD
deleted file mode 100644
index 1a661db2..00000000
--- a/net/Makefile.FreeBSD
+++ /dev/null
@@ -1,6 +0,0 @@
-SRCS+=		iwconfig.sh.in
-INC+=		iwconfig.sh
-
-.SUFFIXES:	.sh.BSD.in
-.sh.BSD.in.sh:
-	${CP} $< $@
diff --git a/net/Makefile.Linux b/net/Makefile.Linux
deleted file mode 100644
index f7fb0870..00000000
--- a/net/Makefile.Linux
+++ /dev/null
@@ -1,9 +0,0 @@
-SRCS+=		iwconfig.sh.in
-INC+=		adsl.sh apipa.sh arping.sh bonding.sh br2684ctl.sh bridge.sh \
-		ccwgroup.sh clip.sh ethtool.sh iproute2.sh ifplugd.sh ip6to4.sh \
-		ipppd.sh iwconfig.sh netplugd.sh pppd.sh pump.sh tuntap.sh udhcpc.sh \
-		vlan.sh
-
-.SUFFIXES:	.sh.Linux.in
-.sh.Linux.in.sh:
-	${CP} $< $@
diff --git a/net/Makefile.NetBSD b/net/Makefile.NetBSD
deleted file mode 100644
index 396bf9f5..00000000
--- a/net/Makefile.NetBSD
+++ /dev/null
@@ -1,5 +0,0 @@
-INC+=		ifwatchd.sh
-
-.SUFFIXES:	.sh.BSD.in
-.sh.BSD.in.sh:
-	${CP} $< $@
diff --git a/runlevels/Makefile b/runlevels/Makefile
index ae4fff1d..782638b2 100644
--- a/runlevels/Makefile
+++ b/runlevels/Makefile
@@ -15,7 +15,26 @@ MK=		../mk
 include ${MK}/sys.mk
 include ${MK}/os.mk
 include ${MK}/gitignore.mk
-include Makefile.${OS}
+
+ifeq ($(OS),BSD)
+BOOT+=		hostid newsyslog savecore syslogd swap-blk
+else ifeq ($(OS),FreeBSD)
+# Generic BSD stuff
+BOOT+=		hostid net.lo0 newsyslog savecore syslogd
+
+# FreeBSD specific stuff
+BOOT+=		adjkerntz dumpon syscons
+else ifeq ($(OS),Linux)
+SYSINIT+=	devfs dmesg
+BOOT+=		hwclock keymaps modules mtab procfs termencoding
+SHUTDOWN+=	killprocs mount-ro
+else ifeq ($(OS),NetBSD)
+# Generic BSD stuff
+BOOT+=		hostid net.lo0 newsyslog savecore syslogd
+
+# NetBSD specific stuff
+BOOT+=		devdb swap-blk ttys wscons
+endif
 
 all:
 
diff --git a/runlevels/Makefile.BSD b/runlevels/Makefile.BSD
deleted file mode 100644
index ffa758c1..00000000
--- a/runlevels/Makefile.BSD
+++ /dev/null
@@ -1 +0,0 @@
-BOOT+=		hostid newsyslog savecore syslogd swap-blk
diff --git a/runlevels/Makefile.FreeBSD b/runlevels/Makefile.FreeBSD
deleted file mode 100644
index 614e965b..00000000
--- a/runlevels/Makefile.FreeBSD
+++ /dev/null
@@ -1,5 +0,0 @@
-# Generic BSD stuff
-BOOT+=		hostid net.lo0 newsyslog savecore syslogd
-
-# FreeBSD specific stuff
-BOOT+=		adjkerntz dumpon syscons
diff --git a/runlevels/Makefile.Linux b/runlevels/Makefile.Linux
deleted file mode 100644
index 251c6b8b..00000000
--- a/runlevels/Makefile.Linux
+++ /dev/null
@@ -1,3 +0,0 @@
-SYSINIT+=	devfs dmesg
-BOOT+=		hwclock keymaps modules mtab procfs termencoding
-SHUTDOWN+=	killprocs mount-ro
diff --git a/runlevels/Makefile.NetBSD b/runlevels/Makefile.NetBSD
deleted file mode 100644
index d76ccea6..00000000
--- a/runlevels/Makefile.NetBSD
+++ /dev/null
@@ -1,5 +0,0 @@
-# Generic BSD stuff
-BOOT+=		hostid net.lo0 newsyslog savecore syslogd
-
-# NetBSD specific stuff
-BOOT+=		devdb swap-blk ttys wscons
diff --git a/sh/Makefile b/sh/Makefile
index 73d46418..72df96a5 100644
--- a/sh/Makefile
+++ b/sh/Makefile
@@ -8,7 +8,33 @@ INSTALLAFTER=	_installafter
 
 MK=	../mk
 include ${MK}/os.mk
-include Makefile.${OS}
+
+ifeq ($(OS),FreeBSD)
+SRCS+=		init.sh.in
+
+.SUFFIXES:	.sh.BSD.in
+.sh.BSD.in.sh:
+	${SED} ${SED_REPLACE} ${SED_EXTRA} $< > $@
+
+else ifeq ($(OS),Linux)
+SRCS+=		init.sh.in init-early.sh.in udhcpc-hook.sh.in
+BIN+=		init-early.sh udhcpc-hook.sh
+
+.SUFFIXES:	.sh.Linux.in
+.sh.Linux.in.sh:
+	${SED} ${SED_REPLACE} ${SED_EXTRA} $< > $@
+
+else ifeq ($(OS),NetBSD)
+SRCS+=		init.sh.in
+
+SRCS+=		ifwatchd-carrier.sh.in ifwatchd-nocarrier.sh.in
+BIN+=		ifwatchd-carrier.sh ifwatchd-nocarrier.sh
+
+.SUFFIXES:	.sh.BSD.in
+.sh.BSD.in.sh:
+	${SED} ${SED_REPLACE} ${SED_EXTRA} $< > $@
+endif
+
 include ${MK}/scripts.mk
 
 _installafter:
diff --git a/sh/Makefile.FreeBSD b/sh/Makefile.FreeBSD
deleted file mode 100644
index d4e6b866..00000000
--- a/sh/Makefile.FreeBSD
+++ /dev/null
@@ -1,6 +0,0 @@
-SRCS+=		init.sh.in
-
-.SUFFIXES:	.sh.BSD.in
-.sh.BSD.in.sh:
-	${SED} ${SED_REPLACE} ${SED_EXTRA} $< > $@
-
diff --git a/sh/Makefile.Linux b/sh/Makefile.Linux
deleted file mode 100644
index fb9208c4..00000000
--- a/sh/Makefile.Linux
+++ /dev/null
@@ -1,7 +0,0 @@
-SRCS+=		init.sh.in init-early.sh.in udhcpc-hook.sh.in
-BIN+=		init-early.sh udhcpc-hook.sh
-
-.SUFFIXES:	.sh.Linux.in
-.sh.Linux.in.sh:
-	${SED} ${SED_REPLACE} ${SED_EXTRA} $< > $@
-
diff --git a/sh/Makefile.NetBSD b/sh/Makefile.NetBSD
deleted file mode 100644
index bd443934..00000000
--- a/sh/Makefile.NetBSD
+++ /dev/null
@@ -1,8 +0,0 @@
-SRCS+=		init.sh.in
-
-SRCS+=		ifwatchd-carrier.sh.in ifwatchd-nocarrier.sh.in
-BIN+=		ifwatchd-carrier.sh ifwatchd-nocarrier.sh
-
-.SUFFIXES:	.sh.BSD.in
-.sh.BSD.in.sh:
-	${SED} ${SED_REPLACE} ${SED_EXTRA} $< > $@