Crystal: Error when running Crystal on Ubuntu

[kazzkiq]

I've installed Crystal in Ubuntu and when I try to run a file it gives me this error:

--: 1: --: cc: not found
Error: execution of command failed with code: 127: `cc -o "/root/.cache/crystal/opt-crystal-src-ecr-process.cr/macro_run" "${@}"  -rdynamic  -lpcre -lgc -lpthread /opt/crystal/src/ext/libcrystal.a -levent -lrt -ldl -L/usr/lib -L/usr/local/lib`

I installed following the docs installation guide.

Any code gives this error. I tried with a HTTP server and later with a simple puts. Both files lead to this error.

On my Macbook everything works perfectly.

---

Crystal version:
Crystal 0.22.0 [3c71228] (2017-04-20) LLVM 3.5.0

OS version:
Ubuntu 16.04.2 LTS x86_64 ($5 Digital Ocean Droplet)
512MB RAM

[mverzilli]

What happens if you run sudo apt-get install build-essential first?

[kazzkiq]

It worked! 🎉

Perhaps this step could be added to the documentation in order to help users facing the same issue in the future?

Thanks!

[mverzilli]

We need to tidy up a bit our release process... I guess it should be declared as a dependency of the Debian package. It's in the radar, don't worry! :)

[matiasgarciaisaia]

@kazzkiq we have crystal-lang/omnibus-crystal#14 for making the packages state their dependencies.

Also, there's a list of every package you need _for compiling Crystal itself_ on the wiki - we should probably list the subset of them that's needed just for _running_ Crystal on the installation page.

Would you mind editing the language reference to add this info that's missing?

[mlobl]

I had a similar issue installing on a relatively fresh Ubuntu 16.04 (OS X was just fine)

/usr/bin/ld: cannot find -lxml2
collect2: error: ld returned 1 exit status
Error: execution of command failed with code: 1: `cc "${@}" -o '/home/mlobl/.cache/crystal/crystal-run-spec.tmp'  -rdynamic  -lxml2 -lpcre -lm -lgc -lpthread /usr/share/crystal/src/ext/libcrystal.a -levent -lrt -ldl -L/usr/lib -L/usr/local/lib`

The dependency I needed to install was libxml2-dev even though I had libxml2 already installed. Hopefully this helps others in the future