nrpe.c:244: undefined reference to `get_dh512' - Error while installing nagios client ubuntu 22.04

Steps of Nagios client setup.

Download source code.

# wget https://codeload.github.com/NagiosEnterprises/nrpe/tar.gz/refs/tags/nrpe-4.0.2

Extract it,

# tar -xvzf nrpe-4.0.2

Configure it,

# cd nrpe-nrpe-4.0.2

# ./configure

# make all

cd ./src/; make ; cd ..
make[1]: Entering directory `/usr/local/src/nagios/nrpe-2.11/src'
gcc -g -O2 -I/usr/local/ssl/include/openssl -I/usr/local/ssl/include -DHAVE_CONFIG_H -o nrpe nrpe.c utils.c -ldl -L/usr/lib64  -lssl -lcrypto -lnsl -lwrap
nrpe.c: In function âmainâ:
nrpe.c:244: warning: assignment makes pointer from integer without a cast
/tmp/cc3msxw1.o: In function `main':
/usr/local/src/nagios/nrpe-2.11/src/nrpe.c:244: undefined reference to `get_dh512'
collect2: ld returned 1 exit status
make[1]: *** [nrpe] Error 1
make[1]: Leaving directory `/usr/local/src/nagios/nrpe-2.11/src'

 It stuck on this error.

Solution:

This issue is related to the Openssl version. In openssl version 3 is creating an issue.

Try Downgrading version of openssl package.

1. Download from here.

openssl_1.1.1f-1ubuntu2.13_amd64.deb

https://drive.google.com/file/d/1ZpIauPw3fERvKn2Wv47fK4vHMvKSZEfJ/view?usp=sharing

libssl1.1_1.1.1f-1ubuntu2.13_amd64.deb

https://drive.google.com/file/d/1PydEUXwTrmPciwlQwsynGKyAt8tYqePs/view?usp=sharing

 2. Install packages.

dpkg -i libssl1.1_1.1.1f-1ubuntu2.13_amd64.deb
dpkg -i  openssl_1.1.1f-1ubuntu2.13_amd64.deb

3. Then try to configure. 

# ./configure

# make all

# make install

And it works !!