Install prerequisites:
sudo apt install subversion g++ zlib1g-dev build-essential git python \
python3 python3-distutils libncurses5-dev gawk gettext unzip file \
libssl-dev wget libelf-dev ecj fastjar java-propose-classpath
sudo dnf install @c-development @development-tools @development-libs \
zlib-static elfutils-libelf-devel gawk unzip file wget python3
Checkout the OpenWRT source tree:
umask 0022
git clone https://git.openwrt.org/openwrt/openwrt.git openwrt-git
cd openwrt-git
Update feeds and generate a minimal configuration:
./scripts/feeds update -a
./scripts/feeds install -a
make menuconfig
- Select the correct
Target System, e.g.Atheros ATH79 (DTS) - Select the correct
Subtarget, e.g.Generic - Select the correct
Target Profile, i.e. your router where OpenWRT is installed. - If needed, a newer compiler can be
selected as well:
Advanced configuration options=>Toolchain Options=>GCC compiler Version.
Before we can build packages, we need to build our toolchain:
make -j$(nproc) tools/install
make -j$(nproc) toolchain/install
If something goes wrong, we can add V=s to our
make options
to gather more details.
As an example, let's build NRPE
for OpenWRT. We need the Makefile and some patches and auxillary files too:
$ find package/network/utils/nrpe/
package/network/utils/nrpe/
package/network/utils/nrpe/files
package/network/utils/nrpe/files/openwrt-init
package/network/utils/nrpe/files/openwrt-procd
package/network/utils/nrpe/patches
package/network/utils/nrpe/patches/100-nrpe.patch
package/network/utils/nrpe/Makefile
Generate a new .config and select either m or y:
$ make oldconfig
nrpe........... Nagios Remote Plugin Executor Server (PACKAGE_nrpe) [M/n/y/?] m
Build with:
make -j$(nproc) package/nrpe/compile
make -j$(nproc) package/nrpe/install
make -j$(nproc) package/index
If all goes well, the (stripped)
binary and package will be available in our build_dir:
$ tar -tvzf bin/packages/mips_24kc/base/nrpe*mips_24kc.ipk && \
ls -go build_dir/target-mips_24kc_musl/nrpe*/ipkg-mips_24kc/nrpe/usr/sbin/nrpe -rw-r--r-- root/root 4 2020-01-29 08:05 ./debian-binary
-rw-r--r-- root/root 21956 2020-01-29 08:05 ./data.tar.gz
-rw-r--r-- root/root 588 2020-01-29 08:05 ./control.tar.gz
-rwxr-xr-x. 1 39445 Mar 7 12:48 build_dir/target-mips_24kc_musl/nrpe-4.0.0/ipkg-mips_24kc/nrpe/usr/sbin/nrpe
NRPE alone won't do much, let's install monitoring-plugins as well:
$ find package/network/utils/monitoring-plugins/
package/network/utils/monitoring-plugins/
package/network/utils/monitoring-plugins/Makefile
Generate a new .config and select either m or y for monitoring-plugins.
make oldconfig
Build with:
make -j$(nproc) package/monitoring-plugins/compile
make -j$(nproc) package/monitoring-plugins/install
make -j$(nproc) package/index
If all goes well, we should have something like this:
$ tar -tvzf bin/packages/mips_24kc/base/monitoring-plugins*mips_24kc.ipk && \
ls -go build_dir/target-mips_24kc_musl/monitoring-plugins*/ipkg-mips_24kc/monitoring-plugins/usr/libexec/nagios/ | tail -5
-rw-r--r-- root/root 4 2020-01-29 08:05 ./debian-binary
-rw-r--r-- root/root 639426 2020-01-29 08:05 ./data.tar.gz
-rw-r--r-- root/root 507 2020-01-29 08:05 ./control.tar.gz
-rwxr-xr-x. 1 33285 Mar 7 23:57 check_udp
-rwxr-xr-x. 1 33029 Mar 7 23:57 check_ups
-rwxr-xr-x. 1 24725 Mar 7 23:57 check_users
-rwxr-xr-x. 1 28917 Mar 7 23:57 negate
-rwxr-xr-x. 1 28805 Mar 7 23:57 urlize