Apache Portable Runtime Utility (APU) development headers... not found

[Shanison Lin]

when i try to run sudo passenger-install-apache2-module 

* 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... found

 * OpenSSL support for Ruby... found

 * RubyGems... found

 * Rake... found at /usr/local/bin/rake

 * rack... found

 * Apache 2... found at /usr/sbin/httpd

 * Apache 2 development headers... found at /usr/sbin/apxs

 * Apache Portable Runtime (APR) development headers... found at /usr/bin/apr-1-config

 * Apache Portable Runtime Utility (APU) development headers... not found

I have APU installed at /usr/bin/apu-1-config. Previously the APR is also not found, so i install passenger by 

sudo passenger-install-apache2-module --apr-config-path /usr/bin/apr-1-config

But there is no option for apu. I have even do this export APU_CONFIG="/usr/bin/apu-1-config". But still it can't find the APU. Any help is greatly appreciated. Additional information:

ruby 1.8.7 (2009-3-1 mbari 8B/0x8770 on patchlevel 72) [i686-linux]

Rails 2.2.2

[Hongli Lai]

'sudo' nukes all environment variables. You need to run 'sudo bash',
*then* set environment variables, *then* run the installer.

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