+# now stable with parallel comilation, so support -j
+ifneq (,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
+ PAR := $(patsubst parallel=%,%,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
+ MAKEFLAGS += -j$(PAR)
+endif
+
+ifneq (,$(findstring nodoc,$(DEB_BUILD_OPTIONS)))
+BUILD_DOCS=n
+else
+BUILD_DOCS=y
+endif
+
+ifneq (,$(findstring nostatic,$(DEB_BUILD_OPTIONS)))
+BUILD_STATIC_LIB=n
+else
+BUILD_STATIC_LIB=y
+endif
+
+# kernel_modules can be passed via DEB_BUILD_OPTIONS to enable building the
+# optional binary kernel modules package. By default it will be built against
+# the current kernel, or ksrc can be passed with a path to the target kernel
+# sources instead.
+ifeq (,$(findstring kernel_modules,$(DEB_BUILD_OPTIONS)))
+DPDK_CONFIG_BUILD_KMOD=n
+KSRC=""
+else
+ifneq (,$(filter ksrc=%,$(DEB_BUILD_OPTIONS)))
+ KSRC := $(patsubst ksrc=%,%,$(filter ksrc=%,$(DEB_BUILD_OPTIONS)))
+else
+ KSRC := /lib/modules/$(shell uname -r)/build
+endif
+
+KVERS := $(shell perl debian/kernel-version $(KSRC))
+export KVERS
+export MODULE_CFLAGS=-fno-PIE
+
+DPDK_CONFIG_BUILD_KMOD=y
+
+# Since the binary module package is generated at build time depending on the
+# local kernel version, we have to append the new package in d/control.
+# We cannot use a separate control file since that wouldn't work with
+# dpkg-genchanges, and also would require a lot of overrides for debhelpers.
+get_built_using ?= $(filter-out (=),$(shell dpkg-query -f='$${source:Package} (=$${source:Version})' -W $1))
+
+build:
+ @if [ x"$(KVERS)" = x ] ; then \
+ echo 'No version in $(KSRC)/include/linux/version.h' >&2; \
+ exit 1; \
+ fi
+ sh debian/prep-modules $(KSRC)
+ cat debian/control.modules >> debian/control
+ dh $@ --with python3,dkms,systemd
+endif
+