make: execvp: g++: Permission denied - ruby-on-rails

I'm trying to install therubyracer on Amazon Linux AMI (~centOS).
[www#ip-10-0-0-125 root]$ gem install therubyracer
Fetching: libv8-3.16.14.3-x86_64-linux.gem (100%)
Successfully installed libv8-3.16.14.3-x86_64-linux
Building native extensions. This could take a while...
ERROR: Error installing therubyracer:
ERROR: Failed to build gem native extension.
/home/www/.rvm/rubies/ruby-2.1.1/bin/ruby extconf.rb
checking for main() in -lpthread... yes
creating Makefile
make "DESTDIR=" clean
make "DESTDIR="
compiling handles.cc
make: execvp: g++: Permission denied
make: *** [handles.o] Error 127
Permission denied # dir_chdir - /root
Gem files will remain installed in /home/www/.rvm/gems/ruby-2.1.1/gems/therubyracer-0.12.1 for inspection.
Results logged to /home/www/.rvm/gems/ruby-2.1.1/extensions/x86_64-linux/2.1.0/therubyracer-0.12.1/gem_make.out
[www#ip-10-0-0-125 root]$
I am not sure what to try.. I'm installing it manually on the server with gem install therubyracer. I have tried doing libv8 first, many different versions and combinations of versions.
I'm running this under the www user in the ~ directory.
Thanks

You haven't installed g++ (the GNU C++ compiler) on your system... that makes it hard to compile things :-).
I don't have a copy of centos handy, but something like sudo yum install g++ will probably get you a compiler.

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Unable to install bcrypt on ubuntu 20.04

My project has ruby 2.6.5, rails 6 and when i tried to run bundle install, bcrypt gem is not installing. I tried sudo apt-get install ruby-dev and sudo apt-get install build-essential commands to resolve the issue and they were not helpful.
Any one can help on this ?
Below is log for it.
Fetching bcrypt-3.1.11.gem
Building native extensions. This could take a while...
ERROR: Error installing bcrypt:
ERROR: Failed to build gem native extension.
current directory: /home/mahesh/.rvm/gems/ruby-2.6.5/gems/bcrypt-3.1.11/ext/mri
/home/mahesh/.rvm/rubies/ruby-2.6.5/bin/ruby -I /home/mahesh/.rvm/rubies/ruby-
2.6.5/lib/ruby/site_ruby/2.6.0 -r ./siteconf20210222-10360-1tmu5r0.rb extconf.rb
creating Makefile
current directory: /home/mahesh/.rvm/gems/ruby-2.6.5/gems/bcrypt-3.1.11/ext/mri
make "DESTDIR=" clean
current directory: /home/mahesh/.rvm/gems/ruby-2.6.5/gems/bcrypt-3.1.11/ext/mri
make "DESTDIR="
compiling bcrypt_ext.c
compiling crypt.c
compiling crypt_blowfish.c
compiling crypt_gensalt.c
compiling wrapper.c
linking shared-object bcrypt_ext.so
current directory: /home/mahesh/.rvm/gems/ruby-2.6.5/gems/bcrypt-3.1.11/ext/mri
make "DESTDIR=" install
make: /usr/bin/mkdir: Command not found
make: *** [Makefile:202: .sitearchdir.time] Error 127
make install failed, exit code 2
Gem files will remain installed in /home/mahesh/.rvm/gems/ruby-2.6.5/gems/bcrypt-3.1.11 for
inspection.
Results logged to /home/mahesh/.rvm/gems/ruby-2.6.5/extensions/x86_64-linux/2.6.0/bcrypt-
3.1.11/gem_make.out
The package looks for /usr/bin/mkdir but on a Debian based system the correct path is /bin/mkdir. Op solved the problem by creating a symlink. It would be better to fix the installer.

Installing json -v '1.8.6' gem, throws gcc error

some one in my team just updated some gem in the gemfile because of which gem json is resolved to version '1.8.6'. Which is not being installed. The error it throws is following:
anas:~$ sudo gem install json -v '1.8.6'
Building native extensions. This could take a while...
ERROR: Error installing json:
ERROR: Failed to build gem native extension.
current directory: /var/lib/gems/2.3.0/gems/json-
1.8.6/ext/json/ext/generator
/usr/bin/ruby2.3 -r ./siteconf20171017-7274-1ea5ank.rb extconf.rb
creating Makefile
current directory: /var/lib/gems/2.3.0/gems/json-
1.8.6/ext/json/ext/generator
make "DESTDIR=" clean
current directory: /var/lib/gems/2.3.0/gems/json-
1.8.86/ext/json/ext/generator
make "DESTDIR="
compiling generator.c
gcc: error: unrecognized command line option ‘-Wdate-time’
gcc: error: unrecognized command line option ‘-fstack-protector-
strong’
Makefile:239: recipe for target 'generator.o' failed
make: *** [generator.o] Error 1
make failed, exit code 2
Gem files will remain installed in /var/lib/gems/2.3.0/gems/json-1.8.6
for inspection.
Results logged to /var/lib/gems/2.3.0/extensions/x86_64-
linux/2.3.0/json-1.8.6/gem_make.out
My ruby is 2.3.1p112 and gcc version is 4.7.4. I have tried to find out which gcc version json -v 1.8.6 use but I did not find anything.
Thanks in advance
As pr my undarstanding the solution is to install libgmp3-dev.
sudo apt-get install libgmp3-dev

Error installing therubyracer on osx 10.12.4

I have gone through a lot of answers on a similar questions but I have not been successful. I am trying to install therubyracer 0.12.3 on my MAC OSX 10.12.4 and I am receiving the following error. Please help. Been stuck with this for two days now.
sudo gem install therubyracer -v '0.12.3'
Building native extensions.
This could take a while... ERROR: Error installing therubyracer:
ERROR: Failed to build gem native extension.
current directory: /Users/aj035785/.rvm/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/therubyracer-0.12.3/ext/v8
/Users/aj035785/.rvm/rubies/ruby-2.3.1/bin/ruby -r
./siteconf20170420-2619-13h8man.rb extconf.rb checking for main() in
-lpthread... yes checking for main() in -lobjc... yes creating Makefile
current directory:
/Users/aj035785/.rvm/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/therubyracer-0.12.3/ext/v8
make "DESTDIR=" clean
current directory:
/Users/aj035785/.rvm/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/therubyracer-0.12.3/ext/v8
make "DESTDIR=" compiling accessor.cc make:
/usr/local/opt/apple-gcc42/bin/g++-4.2: No such file or directory
make: *** [accessor.o] Error 1
make failed, exit code 2
Gem files will remain installed in
/Users/aj035785/.rvm/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/therubyracer-0.12.3
for inspection. Results logged to
/Users/aj035785/.rvm/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/extensions/x86_64-darwin-16/2.3.0/therubyracer-0.12.3/gem_make.out
Blockquote
I feel this might be the root cause -
make: /usr/local/opt/apple-gcc42/bin/g++-4.2: No such file or directory

Error installing rails 4 in mac

I am trying to set up rails in my mac(Yosemite) machine. But when I do
gem install rails
I get the following error. Please help.
Building native extensions. This could take a while...
ERROR: Error installing rails:
ERROR: Failed to build gem native extension.
/Users/Paa/.rvm/rubies/ruby-1.9.3-p547/bin/ruby extconf.rb
creating Makefile
make clean
make
compiling generator.c
make: /usr/local/opt/gcc46/bin/gcc-4.6: No such file or directory
make: *** [generator.o] Error 1
make failed, exit code 2
Gem files will remain installed in /Users/Paa/.rvm/gems/ruby-1.9.3-p547/gems/json-1.8.2 for inspection.
Results logged to /Users/Paa/.rvm/gems/ruby-1.9.3-p547/extensions/x86_64-darwin-13/1.9.1/json-1.8.2/gem_make.out
What am I missing here.??
I think rvm might be trying to use gcc 4.6, which doesn't work properly with rvm. I believe you can:
Uninstall gcc 4.6 (brew rm gcc46)
Pull the latest rvm (rvm get stable)
Retry gem install rails

Error installing gem

I typed 'gem install middleman' in my terminal and got the following error message:
Building native extensions. This could take a while...
ERROR: Error installing middleman:
ERROR: Failed to build gem native extension.
/usr/local/rvm/rubies/ruby-1.9.3-p429/bin/ruby extconf.rb
creating Makefile
make
compiling hitimes.c
make: gcc-4.2: No such file or directory
make: *** [hitimes.o] Error 1
Gem files will remain installed in /usr/local/rvm/gems/ruby-1.9.3-p429/gems/hitimes-1.2.2 for inspection.
Results logged to /usr/local/rvm/gems/ruby-1.9.3-p429/gems/hitimes-1.2.2/ext/hitimes/c/gem_make.out
Looks like you're missing gcc-4.2
Do you have any GCC installed (if you're on a Mac, you need to install Xcode)?
which gcc
If you already have a version of gcc, you can simply symlink to it
ln -s /usr/bin/gcc /usr/bin/gcc-4.2

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