https://github.com/sharkdp/pastel
https://david-peter.de/

pastel v0.8.0
A command-line tool to generate, analyze, convert and manipulate colors  

rust

ca-certificates.tcz is installed 
sudo mkdir -p /etc/ssl/
sudo ln -s /usr/local/etc/ssl/certs /etc/ssl/certs

install latest rust compiler:
    # https://www.rust-lang.org/tools/install
    # reference: https://github.com/rust-lang/rust
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh

Development dependencies: tce-load -i compiletc python3.6 automake cmake curl openssl-1.1.1 pkg-config fontconfig-dev
    compiletc
    python3.6
    automake
    cmake
    curl
    openssl-1.1.1
    pkg-config
    fontconfig-dev

Building on a Unix-like system

Make sure you have installed the dependencies:
    g++ 5.1 or later or clang++ 3.5 or later
    python 3 or 2.7
    GNU make 3.81 or later
    cmake 3.4.3 or later
    curl
    git
    ssl which comes in libssl-dev or openssl-devel
    pkg-config if you are compiling on Linux and targeting Linux
    fontconfig-dev


source $HOME/.cargo/env

wget https://github.com/sharkdp/pastel/archive/v0.8.0.tar.gz

        ?? release.sh (commenting out the non-Linux builds)
    # not these usual rust methods
    # cargo build  (from dir with Cargo.toml)
cargo install --path .

test with
base norestore  

Runtime dependencies: pastel.tcz.dep
    none

find ./squashfs-root -exec touch -m --reference=./squashfs-root/usr/local/bin/pastel {} +

mksquashfs ./squashfs-root ./pastel.tcz -noappend -no-xattrs
mksquashfs ./squashfs-root ./pastel-doc.tcz -noappend -no-xattrs

submitqc --color --libs --fix --strip ./pastel.tcz
submitqc --color --libs --fix --strip ./pastel-doc.tcz

# get the extension files dates the same as tcz
for file in pastel.tcz; do touch --no-create --reference=./squashfs-root/usr/local/bin/pastel $file; done
for file in pastel.tcz.*; do touch --no-create --reference=pastel.tcz $file; done
for file in pastel-doc.tcz.*; do touch --no-create --reference=pastel-doc.tcz $file; done

# set the permissions
for file in pastel.*; do chmod 666 $file; done
for file in pastel-doc.*; do chmod 666 $file; done

#tar all necessary and optional files, example:
tar cvzf ./pastel.tar.gz ./pastel/
tar cvzf ./pastel-doc.tar.gz ./pastel-doc/

save this file with name compile_pastel