$ wget https://ftp.gnu.org/gnu/help2man/help2man-1.47.16.tar.xz
$ tar xvf help2man-1.47.16.tar.xz
$ cd help2man-1.47.16/
$ mkdir build
$ cd build
$ ../configure --prefix=/opt/help2man/1.47.16
$ make
$ make install

$ export PATH=/opt/help2man/1.47.16/bin:${PATH}
$ export LD_LIBRARY_PATH=/opt/help2man/1.47.16/lib:${LD_LIBRARY_PATH}

#!/bin/bash

#############################################################
inst_ver=1.47.16
inst_target=/opt/help2man/${inst_ver}
arch_file="help2man-"${inst_ver}".tar.xz"
target_web="https://ftp.gnu.org/gnu/help2man/"${arch_file}
working_dir=$(cd $(dirname $0); pwd)/help2man-${inst_ver}
#############################################################

if [ -d ${inst_target} ];
then
    echo "${inst_target} is already exist"
    exit 0
fi

mkdir -p ${inst_target} 
if [ $? -ne 0 ];
then
    echo "You do not have write permission on "${inst_target}"."
    echo "Scipt is aborted."
    exit 1
fi

rm -rf ${arch_file} ${working_dir}

wget ${target_web}
if [ $? -ne 0 ];
then
    echo "command is failed"
    echo "wget ${target_web}"
    exit 1
fi
mkdir ${working_dir}
tar xvf ${arch_file} -C ${working_dir} --strip-components 1
cd ${working_dir}
mkdir -p build
cd build
../configure --prefix=${inst_target}
make
make install