Build Recipe for XEphem

dpkg --add-architecture i386
apt update
apt install build-essential git libxext-dev x11proto-xext-dev libxau-dev x11proto-print-dev xutils-dev libtool libtool-bin gfortran-multilib libmotif-dev libx11-dev libxmu-dev libxt-dev x11proto-print-dev libxm4:i386 libuil4:i386 libmrm4:i386 libxm4 libuil4 libmrm4 libmotif-common libmotif-dev libxmu-dev autoconf tcsh libssl-dev -y

For 20.04 LTS

E: Unable to locate package x11proto-print-dev replaced by 	https://launchpad.net/~zeehio/+archive/ubuntu/libxp/+build/19192661/+files/x11proto-print-dev_1.0.5-2ubuntu1~20.04_all.deb
E: Unable to locate package libxm4:i386 libxm4 -- no i386
E: Unable to locate package libuil4:i386 libuil ""
E: Unable to locate package libmrm4:i386 libmrm ""

apt install build-essential git libxext-dev x11proto-xext-dev libxau-dev xutils-dev libtool libtool-bin gfortran-multilib libmotif-dev libx11-dev libxmu-dev libxt-dev x11proto-print-dev libxm4 libuil4 libmrm4 libmotif-common libmotif-dev libxmu-dev autoconf tcsh libssl-dev libxm4 libuil libmrm -y

git clone git://anongit.freedesktop.org/git/xorg/lib/libXp
cd libXp
./autogen.sh
./configure
make
sudo make install
sudo ln -s /usr/local/lib/libXp.so.6.2.0 /usr/lib/libXp.so.6.2.0
sudo ln -s /usr/local/lib/libXp.so.6 /usr/lib/libXp.so.6

1. ln -s /usr/share/aclocal /usr/local/share/aclocal #not needed

Extract XEphem CDs/Archives

download patches
patches listed at http://www.clearskyinstitute.com/xephem/contrib/contrib.html See https://groups.io/g/xephem/message/3561 patch -p0 < {path to patch}