Fetching: therubyracer-0.12.1.gem (100%)
Building native extensions.  This could take a while...
ERROR:  Error installing therubyracer:
	ERROR: Failed to build gem native extension.

    /usr/bin/ruby extconf.rb
checking for main() in -lpthread... yes
creating Makefile

make "DESTDIR="
g++ -I. -I/usr/local/share/gems/gems/libv8-3.16.14.7-x86_64-linux/vendor/v8/include -I/usr/include -I/usr/include/ruby/backward -I/usr/include -I.   -Wall -g -rdynamic -fPIC -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -mtune=generic -m64 -o accessor.o -c accessor.cc
make: g++: Command not found
make: *** [accessor.o] Error 127


Gem files will remain installed in /usr/local/share/gems/gems/therubyracer-0.12.1 for inspection.
Results logged to /usr/local/share/gems/gems/therubyracer-0.12.1/ext/v8/gem_make.out