Failing to compile on macOS/Ruby 2.7.1 but not sure why

[knu]

Failing to compile on macOS/Ruby 2.7.1 but not sure why

[edbond]

After reinstalling jemalloc gem installed:

▶ brew reinstall jemalloc
==> Reinstalling jemalloc
==> Downloading https://homebrew.bintray.com/bottles/jemalloc-5.2.1_1.catalina.bottle.tar.gz
==> Downloading from https://akamai.bintray.com/b1/b1b211e5bead798c236d478dd74310a97a7b59470f607b608c07222648b08bf5?__gda__=exp=1587473617~hmac=2fe57
######################################################################## 100.0%
==> Pouring jemalloc-5.2.1_1.catalina.bottle.tar.gz
🍺  /usr/local/Cellar/jemalloc/5.2.1_1: 16 files, 2MB

▶ gem install unf_ext -v '0.0.7.6'
Building native extensions. This could take a while...
Successfully installed unf_ext-0.0.7.6
Parsing documentation for unf_ext-0.0.7.6
Installing ri documentation for unf_ext-0.0.7.6
Done installing documentation for unf_ext after 1 seconds
1 gem installed

[csuhta]

I was able to fix this on MacOS 10.15.4, but I'm not sure what did it:

• Reinstall MacOS Developer Tools
• Re-install Jemalloc and Ruby (using homebrew and ruby-install)
• Gem bundled correctly after that

[jakubgs]

Seeing the same issue. No clue what this is about.

[fkapsahili]

If anyone should have a similar problem:
I still got the same error despite these steps. It just didn't work when the Command Tools were installed - the following steps, one after the other, were a workaround for me:

sudo rm -rf /Library/Developer/CommandLineTools
gem install unf_ext -v 0.0.7.7
sudo xcode-select --install

[marianodominguez]

Is there a solution for Linux? I installed all development tools and c++ devel libs, build is failing with 2.7
Centos 7

error.txt

[mariano-dm]

It seems this combination worked in 2.7

• gem: erubis
  version: "2.7.0"
  • gem: unf_ext
    version: "0.0.7.5"

[bcouetil]

If you come here in 2023, like me, DON'T UNINSTALL anything related to XCode. No need.

There are great chance it is because your system Ruby, which is old, is loaded before your Homebrew Ruby.

Just follow this guide to have a ruby command using your latest Ruby installation.