Joplin Terminal in Mint 20 problem

Hi there,
i tried to installed joplin terminal like here (https://joplinapp.org/terminal/ ) on my Mint 20 but no success.

esc@M19-2120:~$ NPM_CONFIG_PREFIX=~/.joplin-bin npm install -g joplin
npm WARN deprecated jssha@2.4.2: jsSHA versions < 3.0.0 will no longer receive feature updates
npm WARN deprecated request@2.88.2: request has been deprecated, see https://github.com/request/request/issues/3142
npm WARN deprecated har-validator@5.1.5: this library is no longer supported
npm WARN deprecated urix@0.1.0: Please see https://github.com/lydell/urix#deprecated
npm WARN deprecated resolve-url@0.2.1: https://github.com/lydell/resolve-url#deprecated
npm WARN deprecated request-promise-native@1.0.9: request-promise-native has been deprecated because it extends the now deprecated request package, see https://github.com/request/request/issues/3142
prebuild-install WARN install No prebuilt binaries found (target=14.9.0 runtime=node arch=x64 libc= platform=linux)
Package libsecret-1 was not found in the pkg-config search path.
Perhaps you should add the directory containing `libsecret-1.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libsecret-1' found
gyp: Call to 'pkg-config --cflags libsecret-1' returned exit status 1 while in binding.gyp. while trying to load binding.gyp
gyp ERR! configure error 
gyp ERR! stack Error: `gyp` failed with exit code: 1
gyp ERR! stack     at ChildProcess.onCpExit (/usr/lib/node_modules/npm/node_modules/node-gyp/lib/configure.js:351:16)
gyp ERR! stack     at ChildProcess.emit (events.js:314:20)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:276:12)
gyp ERR! System Linux 5.4.0-26-generic
gyp ERR! command "/usr/bin/node" "/usr/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
gyp ERR! cwd /home/esc/.joplin-bin/lib/node_modules/joplin/node_modules/keytar
gyp ERR! node -v v14.9.0
gyp ERR! node-gyp -v v5.1.0
gyp ERR! not ok 
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! keytar@5.6.0 install: `prebuild-install || node-gyp rebuild`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the keytar@5.6.0 install script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/esc/.npm/_logs/2020-09-06T09_08_27_596Z-debug.log 

Can someone help me please?
Thx!

sudo apt-get install -y libsecret-1-dev

thank you for the hint. But in fresh mint 20 right after installation, apart from libsecret-1-dev, it was missing:
g++
python
git
and of course nodejs