Failed to build Sage from source using gcc 10

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I'm trying to build SageMath from source on Ubuntu 20.04. Below is the exact process I tried to follow (taking notes to be able to pass to other students with little/no linux experience--like me--so I try to explain each step), but the build crashed on on gcc-10 build with "undefined reference to ZSTD_compress" and a bunch of other ZSTD-related items. Two questions: why doesn't the below install all needed dependencies, but more importantly, with what I passed in, I don't think it should be trying to build gcc-10 anyway, so why is it? Thanks!

• This method will install a new sage python environment that will show up in our anaconda-navigator called sage-pyenv.

• Install all the prerecs. Highly recommended ones for better experience are after yasm; optional ones to speed up build time after tk-dev (Note: gcc-7, g++-c, and gfortran-7 installed to /usr/bin.):

  sudo apt-get install bc binutils bzip2 ca-certificates cliquer cmake curl ecl eclib-tools fflas-ffpack flintqs g++ gcc gfan gfortran glpk-utils gmp-ecm lcalc libatomic-ops-dev libboost-dev libbraiding-dev libbrial-dev libbrial-groebner-dev libbz2-dev libcdd-dev libcdd-tools libcliquer-dev libcurl4-openssl-dev libec-dev libecm-dev libffi-dev libflint-arb-dev libflint-dev libfreetype6-dev libgc-dev libgd-dev libgf2x-dev libgiac-dev libgivaro-dev libglpk-dev libgmp-dev libgsl-dev libhomfly-dev libiml-dev liblfunction-dev liblrcalc-dev liblzma-dev libm4rie-dev libmpc-dev libmpfi-dev libmpfr-dev libncurses5-dev libntl-dev libopenblas-dev libpari-dev libpcre3-dev libplanarity-dev libppl-dev libpython3-dev libreadline-dev librw-dev libsqlite3-dev libssl-dev libsuitesparse-dev libsymmetrica2-dev libz-dev libzmq3-dev libzn-poly-dev m4 make nauty openssl palp pari-doc pari-elldata pari-galdata pari-galpol pari-gp2c pari-seadata patch perl pkg-config planarity ppl-dev python3 python3 python3-distutils r-base-dev r-cran-lattice sqlite3 sympow tachyon tar tox xcas xz-utils yasm gcc-7 g++-7 gfortran-7 dvipng ffmpeg imagemagick texlive texlive-latex-recommended texlive-latex-recommended-doc texlive-fonts-recommended texlive-fonts-recommended-doc texlive-xetex latexmk pandoc default-jdk libavdevice-dev tk tk-dev coinor-cbc coinor-libcbc-dev git graphviz libfile-slurp-perl libigraph-dev libisl-dev libjson-perl libmongodb-perl libnauty-dev libperl-dev libsvg-perl libterm-readkey-perl libterm-readline-gnu-perl libterm-readline-gnu-perl libxml-libxslt-perl libxml-writer-perl libxml2-dev libxml2-dev lrslib ninja-build pari-gp2c

• Get the source code:

  mkdir ~/Codes

  cd ~/Codes

  git clone -c core.symlinks=true --branch master https://github.com/sagemath/sage.git

• Set up Python environment:

  cd ~/Codes/sage

  ./bootstrap

  • After building the environment, I was told that conda went ahead and built the environment as Python 3.10, which is too new for Sage. Per this post, 3.8 and 3.9 are supported. It will build a 3.9 during build. So, tweak some things to make sure we get that version.
  • Go into ~/Codes/sage/environment-optional.yml, and
    • change the environment name to sage-pyenv
    • add python=3.9 to dependencies, per this post

  conda env create -f environment-optional.yml

  conda activate sage-pyenv

• Build it:

  ./bootstrap

  • Point it to system gcc-7 and fortran-7 for compilation, since it seems to fail when trying to build gcc-10. It can’t use gcc-11 as of the time of this writing. Also point it to this conda environment we just created.

  CC=gcc-7 CXX=g++ FC=gfortran-7 ./configure --prefix=$CONDA_PREFIX --with-python=/home/nuker/anaconda3/envs/sage-pyenv/bin/python

  • This came back with a list of things that will provide extra capability and help build time. I just made sure that those got installed:

    conda install arb cddlib curl eclib ecm libflint giac iml lcalc libgd libhomfly openssl pari pari-elldata pari-galdata pari-galpol pari-seadata pari-galdata pari-seadata-small r r-essentials suitesparse xz lrslib pari-nftables

  • Rerun the ./configure line above (other places suggest ./config.status --recheck && ./config.status, but those would still install a new python-3.9 install).

    make

After make, it would crash out with notes about ZSTD.