nodegit: npm install nodegit, gitkraken, CycligentGitTool all fail to install, run, on Linux Mint Cinnamon

When I try to npm install nodegit, I get (with both node v6.9.1 and v7.7.1):

npm WARN prefer global node-gyp@3.5.0 should be installed with -g

> nodegit@0.18.0 install /home/flow/temp/resolving-issue-nodegit-libcurl/node_modules/nodegit
> node lifecycleScripts/preinstall && node lifecycleScripts/install

[nodegit] Running pre-install script
[nodegit] Configuring libssh2.
{ Error: Command failed: /home/flow/temp/resolving-issue-nodegit-libcurl/node_modules/nodegit/vendor/libssh2/configure --with-libssl-prefix=/home/flow/temp/resolving-issue-nodegit-libcurl/node_modules/nodegit/vendor/openssl/openssl
/home/flow/temp/resolving-issue-nodegit-libcurl/node_modules/nodegit/vendor/libssh2/missing: Unknown `--is-lightweight' option
Try `/home/flow/temp/resolving-issue-nodegit-libcurl/node_modules/nodegit/vendor/libssh2/missing --help' for more information
configure: WARNING: 'missing' script is too old or missing
configure: error: No crypto library found!
Try --with-libssl-prefix=PATH
 or --with-libgcrypt-prefix=PATH
 or --with-wincng on Windows

    at ChildProcess.exithandler (child_process.js:206:12)
    at emitTwo (events.js:106:13)
    at ChildProcess.emit (events.js:191:7)
    at maybeClose (internal/child_process.js:877:16)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:226:5)
  killed: false,
  code: 1,
  signal: null,
  cmd: '/home/flow/temp/resolving-issue-nodegit-libcurl/node_modules/nodegit/vendor/libssh2/configure --with-libssl-prefix=/home/flow/temp/resolving-issue-nodegit-libcurl/node_modules/nodegit/vendor/openssl/openssl' }
/home/flow/temp/resolving-issue-nodegit-libcurl/node_modules/nodegit/vendor/libssh2/missing: Unknown `--is-lightweight' option
Try `/home/flow/temp/resolving-issue-nodegit-libcurl/node_modules/nodegit/vendor/libssh2/missing --help' for more information
configure: WARNING: 'missing' script is too old or missing
configure: error: No crypto library found!
Try --with-libssl-prefix=PATH
 or --with-libgcrypt-prefix=PATH
 or --with-wincng on Windows

[nodegit] ERROR - Could not finish preinstall
{ Error: Command failed: /home/flow/temp/resolving-issue-nodegit-libcurl/node_modules/nodegit/vendor/libssh2/configure --with-libssl-prefix=/home/flow/temp/resolving-issue-nodegit-libcurl/node_modules/nodegit/vendor/openssl/openssl
/home/flow/temp/resolving-issue-nodegit-libcurl/node_modules/nodegit/vendor/libssh2/missing: Unknown `--is-lightweight' option
Try `/home/flow/temp/resolving-issue-nodegit-libcurl/node_modules/nodegit/vendor/libssh2/missing --help' for more information
configure: WARNING: 'missing' script is too old or missing
configure: error: No crypto library found!
Try --with-libssl-prefix=PATH
 or --with-libgcrypt-prefix=PATH
 or --with-wincng on Windows

    at ChildProcess.exithandler (child_process.js:206:12)
    at emitTwo (events.js:106:13)
    at ChildProcess.emit (events.js:191:7)
    at maybeClose (internal/child_process.js:877:16)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:226:5)
  killed: false,
  code: 1,
  signal: null,
  cmd: '/home/flow/temp/resolving-issue-nodegit-libcurl/node_modules/nodegit/vendor/libssh2/configure --with-libssl-prefix=/home/flow/temp/resolving-issue-nodegit-libcurl/node_modules/nodegit/vendor/openssl/openssl' }
npm WARN resolving-issue-nodegit-libcurl@1.0.0 No description
npm WARN resolving-issue-nodegit-libcurl@1.0.0 No repository field.
npm ERR! Linux 4.4.0-62-generic
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "install" "--save" "nodegit"
npm ERR! node v6.9.1
npm ERR! npm  v3.10.8
npm ERR! code ELIFECYCLE

npm ERR! nodegit@0.18.0 install: `node lifecycleScripts/preinstall && node lifecycleScripts/install`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the nodegit@0.18.0 install script 'node lifecycleScripts/preinstall && node lifecycleScripts/install'.

In related news (https://github.com/electron/electron/issues/8853), both gitkraken and Cycligent Git Tool refuse to run, and in both cases, nodegit being unable to load libcurl.so.4 would appear to be the point of failure:

/usr/lib ► gitkraken
Node started time: 1488472940858
libcurl.so.4: cannot open shared object file: No such file or directory
Error: libcurl.so.4: cannot open shared object file: No such file or directory
    at Error (native)
    at process.module.(anonymous function) [as dlopen] (ELECTRON_ASAR.js:158:20)
    at Object.Module._extensions..node (module.js:568:18)
    at Object.module.(anonymous function) [as .node] (ELECTRON_ASAR.js:169:18)
    at Module.load (module.js:456:32)
    at tryModuleLoad (module.js:415:12)
    at Function.Module._load (module.js:407:3)
    at Module.require (module.js:466:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/usr/share/gitkraken/resources/app.asar/node_modules/nodegit/dist/nodegit.js:11:12)
    at Module._compile (module.js:541:32)
    ...

This is on Linux Mint Cinnamon:

► uname -a && cat /etc/issue
Linux enceladus 4.4.0-62-generic #83-Ubuntu SMP Wed Jan 18 14:10:15 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
Linux Mint 18 Sarah