I will follow your steps because I have compiled texmacs, but I want to make the deb

Step by step guide to make a debian package for GNU Guile 1.8.8 by yourself

Step 1: Prepare your build environment.

sudo apt install devscripts

Step 2: Clone the texmacs branch of guile.

git clone --depth 10 -b texmacs --single-branch  address@hidden:texmacs/guile.git

Step 3: Make your own debs.

cd guile
dpkg-buildpackage -us -uc -b

Great! Now the wanted debs has been generated:

$ ls ../*deb
../guile-1.8_1.8.8+1-10_amd64.deb         ../guile-1.8-dev_1.8.8+1-10_amd64.deb  ../guile-1.8-libs_1.8.8+1-10_amd64.deb
../guile-1.8-dbgsym_1.8.8+1-10_amd64.deb  ../guile-1.8-doc_1.8.8+1-10_all.deb    ../guile-1.8-libs-dbgsym_1.8.8+1-10_amd64.deb

Install guile-1.8, guile-1.8-dev, guile-1.8-libs via dpkg.