Installing Apache Passenger , Ruby Development Headers Not Found - ruby-on-rails

Question

I have a RoR app that needs to be hosted on Apache, so I have been trying to install Apache Passenger. When I run the following command:
sudo passenger-install-apache2-module
I get:
Checking for required software...
* GNU C++ compiler... found at /usr/bin/g++
* Curl development headers with SSL support... found
* OpenSSL development headers... found
* Zlib development headers... found
* Ruby development headers... not found
* OpenSSL support for Ruby... found
* RubyGems... found
* Rake... found at /usr/local/bin/rake
* rack... found
* Apache 2... found at /usr/sbin/apache2
* Apache 2 development headers... found at /usr/bin/apxs2
* Apache Portable Runtime (APR) development headers... found at /usr/bin/apr-1-config
* Apache Portable Runtime Utility (APU) development headers... found at /usr/bin/apu-1-config
So it asked me to run the following command:
sudo apt-get install ruby1.8-dev
and I have done this with the following result
Reading package lists... Done
Building dependency tree
Reading state information... Done
ruby1.8-dev is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 40 not upgraded.
So when I run:
sudo passenger-install-apache2-module
I get the same result asking me to run:
sudo apt-get install ruby1.8-dev

Answer 1

If, like me, you are running the apt package ruby1.9.1 instead of 1.8 then install ruby1.9.1-dev instead
sudo apt-get install ruby1.9.1-dev
This worked for me. Hope it helps.

Answer 2

After installing the missing headers, go back to the beginning and recompile passenger:
gem install passenger

Answer 3

Try uninstalling ruby1.9 and installing ruby1.8 instead then reinstall the passenger gem. This worked for me.

Answer 4

First install packages:
for Ubuntu:
sudo apt-get install libcurl4-gnutls-dev
sudo apt-get install apache2-dev
for CentOS (good tutorial):
yum install curl-devel apache2-devel
After install gem:
gem install passenger
And successfully configurate it:
sudo passenger-install-apache2-module

Answer 5

I have found that with some Passenger requirements you need to log out of and then log back into the current user after you've installed them before passenger-install-apache2-module recognises the changed configuration.