Can't install gem json v 1.8.6

[choallin]

I have to work on an old rails 4.2 codebase. I have installed Ruby 2.3 as a snap package - I am trying to avoid rvm. Now, when I run bundle install it complains that it can't install the json gem. Here is the error message:

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

current directory: /home/user/.gem/gems/json-1.8.6/ext/json/ext/generator //bin/ruby -r ./siteconf20190430-29073-znwkkd.rb extconf.rb sh: 1: //bin/ruby: not found

extconf failed, exit code 127

When I try to install just the gem with 'gem install json -v '1.8.6' --source 'https://rubygems.org/'' I get this error:

ERROR: Error installing json: ERROR: Failed to build gem native extension.

current directory: /home/user/.gem/gems/json-1.8.6/ext/json/ext/generator /snap/bin/ruby -r ./siteconf20190430-30141-z86zxd.rb extconf.rb mkmf.rb can't find header files for ruby at /snap/ruby/109/lib/ruby/include/ruby.h

extconf failed, exit code 1

So, as far as I can tell the native extension is looking in the wrong directory for the ruby headers - I guess...

[dayyan]

I am having the same problem, gem install looks in /snap/ruby/109/lib/ruby/include:

$ gem install mysql2:0.3.21
Building native extensions.  This could take a while...
ERROR:  Error installing mysql2:
    ERROR: Failed to build gem native extension.

    current directory: /home/dayyan.lord/.gem/gems/mysql2-0.3.21/ext/mysql2
/snap/bin/ruby -r ./siteconf20190503-21474-2vfbku.rb extconf.rb
mkmf.rb can't find header files for ruby at /snap/ruby/109/lib/ruby/include/ruby.h

extconf failed, exit code 1

Gem files will remain installed in /home/dayyan.lord/.gem/gems/mysql2-0.3.21 for inspection.
Results logged to /home/dayyan.lord/.gem/extensions/x86_64-linux/2.3.0-static/mysql2-0.3.21/gem_make.out

The current location is:

$ ls /snap/ruby/109/include/ruby-2.3.0
ruby  ruby.h  x86_64-linux

[choallin]

@dayyan Have you found a solution to this?

[dayyan]

@choallin Sorry, I have not. I ended up compiling Ruby copying the same commands the Dockerfile uses.

[hsbt]

Hi all, Thanks to reporting this. I confirmed this is an issue of my package script for snap. I try to investigate json and mysql2 cases.

[bmaupin]

It seems like this could be the same problem I ran into trying to install eventmachine: https://github.com/eventmachine/eventmachine/issues/881

Based on the comments there, it sounds like bundle is unable to find the Ruby headers.

[znz]

After https://github.com/ruby/snap.ruby/pull/26, installing gem with ext failed with glibc version mismatch on Debian 10 (buster).

I think this does not happen on ubuntu-20.04, but I don't know how to resolve this issue on other platform without glibc 2.29.

vagrant@buster:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 10 (buster)
Release:    10
Codename:   buster
vagrant@buster:~$ gem i json
Building native extensions. This could take a while...
ERROR:  Error installing json:
    ERROR: Failed to build gem native extension.

    current directory: /home/vagrant/.gem/gems/json-2.6.0/ext/json/ext/parser
/snap/bin/ruby -I /snap/ruby/232/lib/ruby/3.0.0 -r ./siteconf20211020-3495-9mcx7g.rb extconf.rb
checking for rb_enc_raise() in ruby.h... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
    --with-opt-dir
    --without-opt-dir
    --with-opt-include
    --without-opt-include=${opt-dir}/include
    --with-opt-lib
    --without-opt-lib=${opt-dir}/lib
    --with-make-prog
    --without-make-prog
    --srcdir=.
    --curdir
    --ruby=/snap/ruby/232/bin/$(RUBY_BASE_NAME)
/snap/ruby/232/lib/ruby/3.0.0/mkmf.rb:471:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
    from /snap/ruby/232/lib/ruby/3.0.0/mkmf.rb:564:in `try_link0'
    from /snap/ruby/232/lib/ruby/3.0.0/mkmf.rb:582:in `try_link'
    from /snap/ruby/232/lib/ruby/3.0.0/mkmf.rb:794:in `try_func'
    from /snap/ruby/232/lib/ruby/3.0.0/mkmf.rb:1083:in `block in have_func'
    from /snap/ruby/232/lib/ruby/3.0.0/mkmf.rb:971:in `block in checking_for'
    from /snap/ruby/232/lib/ruby/3.0.0/mkmf.rb:361:in `block (2 levels) in postpone'
    from /snap/ruby/232/lib/ruby/3.0.0/mkmf.rb:331:in `open'
    from /snap/ruby/232/lib/ruby/3.0.0/mkmf.rb:361:in `block in postpone'
    from /snap/ruby/232/lib/ruby/3.0.0/mkmf.rb:331:in `open'
    from /snap/ruby/232/lib/ruby/3.0.0/mkmf.rb:357:in `postpone'
    from /snap/ruby/232/lib/ruby/3.0.0/mkmf.rb:970:in `checking_for'
    from /snap/ruby/232/lib/ruby/3.0.0/mkmf.rb:1082:in `have_func'
    from extconf.rb:4:in `<main>'

To see why this extension failed to compile, please check the mkmf.log which can be found here:

  /home/vagrant/.gem/extensions/x86_64-linux/3.0.0/json-2.6.0/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /home/vagrant/.gem/gems/json-2.6.0 for inspection.
Results logged to /home/vagrant/.gem/extensions/x86_64-linux/3.0.0/json-2.6.0/gem_make.out
vagrant@buster:~$ cat /home/vagrant/.gem/extensions/x86_64-linux/3.0.0/json-2.6.0/mkmf.log
"gcc -o conftest -I/snap/ruby/232/include/ruby-3.0.0/x86_64-linux -I/snap/ruby/232/include/ruby-3.0.0/ruby/backward -I/snap/ruby/232/include/ruby-3.0.0 -I.    -O3 -ggdb3 -Wall -Wextra -Wdeprecated-declarations -Wduplicated-cond -Wimplicit-function-declaration -Wimplicit-int -Wmisleading-indentation -Wpointer-arith -Wwrite-strings -Wimplicit-fallthrough=0 -Wmissing-noreturn -Wno-cast-function-type -Wno-constant-logical-operand -Wno-long-long -Wno-missing-field-initializers -Wno-overlength-strings -Wno-packed-bitfield-compat -Wno-parentheses-equality -Wno-self-assign -Wno-tautological-compare -Wno-unused-parameter -Wno-unused-value -Wsuggest-attribute=format -Wsuggest-attribute=noreturn -Wunused-variable  -fPIC conftest.c  -L. -L/snap/ruby/232/lib -Wl,-rpath,/snap/ruby/232/lib -L. -L/root/parts/ruby/install/usr/lib -L/root/parts/ruby/install/usr/lib/x86_64-linux-gnu -fstack-protector-strong -rdynamic -Wl,-export-dynamic     -Wl,-rpath,/snap/ruby/232/lib -L/snap/ruby/232/lib -lruby  -lm   -lc"
/usr/bin/ld: /snap/ruby/232/lib/libruby.so: undefined reference to `log2@GLIBC_2.29'
/usr/bin/ld: /snap/ruby/232/lib/libruby.so: undefined reference to `log@GLIBC_2.29'
/usr/bin/ld: //snap/core20/current/lib/x86_64-linux-gnu/libpthread.so.0: undefined reference to `__twalk_r@GLIBC_PRIVATE'
/usr/bin/ld: /snap/ruby/232/lib/libruby.so: undefined reference to `pow@GLIBC_2.29'
/usr/bin/ld: /snap/ruby/232/lib/libruby.so: undefined reference to `exp@GLIBC_2.29'
collect2: error: ld returned 1 exit status
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: int main(int argc, char **argv)
4: {
5:   return !!argv[argc];
6: }
/* end */

[hloeung]

Seeing this as well, with a different set of gems - https://github.com/ruby/snap.ruby/issues/28