# Passenger-\>fastthread.c1 will not compile

**URL:** <https://www.ruby-forum.com/t/passenger-fastthread-c1-will-not-compile/193522>\
**Category:** Ruby\
**Created:** [August 19, 2010, 4:54am UTC](https://www.ruby-forum.com/t/passenger-fastthread-c1-will-not-compile/193522 "2010-08-19T04:54:33Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![jmoncrieff](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/8491ac/32.png) [@jmoncrieff](https://www.ruby-forum.com/u/jmoncrieff)\
**Post date:** [August 19, 2010, 4:54am UTC](https://www.ruby-forum.com/t/passenger-fastthread-c1-will-not-compile/193522/1 "2010-08-19T04:54:33Z")

</div>

Good Day,

I am trying to get passenger running on one of our servers at work but  
when I run gem install passenger

## it seems not to be compiling here is the Output i am getting

root@web1 jeff]# gem install passenger  
Building native extensions. This could take a while…  
ERROR: Error installing passenger:  
ERROR: Failed to build gem native extension.

/usr/bin/ruby extconf.rb  
creating Makefile

make  
gcc -I. -I/usr/lib/ruby/1.8/i686-linux -I/usr/lib/ruby/1.8/i686-linux  
-I. -fPIC -O2 -g -march=i686 -Wall -fPIC -c fastthread.c  
fastthread.c:1: error: CPU you selected does not support x86-64  
instruction set  
make: \*\*\* [fastthread.o] Error 1

## Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/fastthread-1.0.7 for inspection. Results logged to /usr/lib/ruby/gems/1.8/gems/fastthread-1.0.7/ext/fastthread/gem\_make.out [root@web1 jeff]#

This box is run centos 5.4(Final)  
kernel:"Linux xxxx.xxxx 2.6.18-164.11.1.el5xen #1 SMP Wed Jan 20  
08:06:04 EST 2010 x86\_64 x86\_64 x86\_64 GNU/Linux|