+ifeq ($(strip $(CONFIG_BUILD_AT_ONCE)),y)
+libraries-y:=
+# Which parts of the internal libs are requested?
+# Per default we only want what was actually selected.
+# -a denotes all while -y denotes the selected ones.
+ifeq ($(strip $(CONFIG_FEATURE_FULL_LIBBUSYBOX)),y)
+LIBRARY_DEFINE:=$(LIBRARY_DEFINE-a)
+LIBRARY_SRC :=$(LIBRARY_SRC-a)
+else # CONFIG_FEATURE_FULL_LIBBUSYBOX
+LIBRARY_DEFINE:=$(LIBRARY_DEFINE-y)
+LIBRARY_SRC :=$(LIBRARY_SRC-y)
+endif # CONFIG_FEATURE_FULL_LIBBUSYBOX
+APPLET_SRC:=$(APPLET_SRC-y)
+APPLETS_DEFINE:=$(APPLETS_DEFINE-y)
+else # CONFIG_BUILD_AT_ONCE
+# no --combine, build archives out of the individual .o
+# This was the old way the binary was built.
+libbusybox-obj:=archival/libunarchive/libunarchive.a \
+ networking/libiproute/libiproute.a \
+ libpwdgrp/libpwdgrp.a \
+ coreutils/libcoreutils/libcoreutils.a \
+ libbb/libbb.a
+libbusybox-obj:=$(patsubst %,$(top_builddir)/%,$(libbusybox-obj))
+
+ifeq ($(strip $(CONFIG_FEATURE_SHARED_BUSYBOX)),y)
+# linking against libbusybox, so don't build the .a already contained in the .so
+libraries-y:=$(filter-out $(libbusybox-obj),$(libraries-y))
+endif # CONFIG_FEATURE_SHARED_BUSYBOX
+endif # CONFIG_BUILD_AT_ONCE
+
+
+ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
+LD_LIBBUSYBOX:=libbusybox.so
+LIBBUSYBOX_SONAME:=$(LD_LIBBUSYBOX).$(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL_VERSION)
+DO_INSTALL_LIBS:=$(LD_LIBBUSYBOX) \
+ $(LD_LIBBUSYBOX).$(MAJOR_VERSION) \
+ $(LD_LIBBUSYBOX).$(MAJOR_VERSION).$(MINOR_VERSION)
+endif # CONFIG_BUILD_LIBBUSYBOX
+
+ifeq ($(strip $(CONFIG_BUILD_AT_ONCE)),y)
+ifneq ($(strip $(CONFIG_FEATURE_SHARED_BUSYBOX)),y)
+# --combine but not linking against libbusybox, so compile all
+BUSYBOX_SRC := $(LIBRARY_SRC)
+BUSYBOX_DEFINE:= $(LIBRARY_DEFINE)
+endif # !CONFIG_FEATURE_SHARED_BUSYBOX
+$(LIBBUSYBOX_SONAME): $(LIBRARY_SRC)
+else # CONFIG_BUILD_AT_ONCE
+$(LIBBUSYBOX_SONAME): $(libbusybox-obj)
+endif # CONFIG_BUILD_AT_ONCE
+
+ifeq ($(strip $(CONFIG_FEATURE_SHARED_BUSYBOX)),y)
+LDBUSYBOX:=-L$(top_builddir) -lbusybox
+endif
+
+ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
+$(LIBBUSYBOX_SONAME):
+ifndef MAJOR_VERSION
+ $(error MAJOR_VERSION needed for $@ is not defined)
+endif
+ $(do_link) $(LIB_CFLAGS) $(CFLAGS_COMBINE) \
+ -Wl,-soname=$(LD_LIBBUSYBOX).$(MAJOR_VERSION) \
+ -Wl,-z,combreloc $(LIB_LDFLAGS) \
+ -o $(@) \
+ -Wl,--start-group -Wl,--whole-archive \
+ $(LIBRARY_DEFINE) $(^) \
+ -Wl,--no-whole-archive -Wl,--end-group
+ @rm -f $(DO_INSTALL_LIBS)
+ @for i in $(DO_INSTALL_LIBS); do ln -s $(@) $$i ; done
+ $(do_strip)
+
+endif # ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
+
+busybox_unstripped: .depend $(LIBBUSYBOX_SONAME) $(BUSYBOX_SRC) $(libraries-y)
+ $(do_link) $(PROG_CFLAGS) $(PROG_LDFLAGS) $(CFLAGS_COMBINE) \
+ -o $@ -Wl,--start-group \
+ $(APPLETS_DEFINE) $(APPLET_SRC) \
+ $(BUSYBOX_DEFINE) $(BUSYBOX_SRC) $(libraries-y) \
+ $(LDBUSYBOX) $(LIBRARIES) \
+ -Wl,--end-group
+
+busybox: busybox_unstripped
+ $(Q)cp busybox_unstripped busybox
+ $(do_strip)
+
+%.bflt: %_unstripped
+ $(do_elf2flt)
+
+busybox.links: $(top_srcdir)/applets/busybox.mkll include/bb_config.h $(top_srcdir)/include/applets.h
+ $(Q)-$(SHELL) $^ >$@