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Monday, August 15, 2011

fail to install myql gem for ruby

You tried to install mysql gem on linux:

$ gem install mysql
Building native extensions.  This could take a while...
ERROR:  Error installing mysql:
	ERROR: Failed to build gem native extension.

/home/t/ruby-1.9.2-p136-1/bin/ruby extconf.rb
checking for mysql_ssl_set()... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers.  Check the mkmf.log file for more
details.  You may need configuration options.

Provided configuration options:
/home/t/ruby-1.9.2-p136-1/lib/ruby/1.9.1/mkmf.rb:368:in `try_do': The complier failed to generate an executable file. (RuntimeError)
You have to install development tools first.
	from /home/t/ruby-1.9.2-p136-1/lib/ruby/1.9.1/mkmf.rb:435:in `try_link0'
	from /home/t/ruby-1.9.2-p136-1/lib/ruby/1.9.1/mkmf.rb:440:in `try_link'
	from /home/t/ruby-1.9.2-p136-1/lib/ruby/1.9.1/mkmf.rb:552:in `try_func'
	from /home/t/ruby-1.9.2-p136-1/lib/ruby/1.9.1/mkmf.rb:797:in `block in have_func'
	from /home/t/ruby-1.9.2-p136-1/lib/ruby/1.9.1/mkmf.rb:693:in `block in checking_for'
	from /home/t/ruby-1.9.2-p136-1/lib/ruby/1.9.1/mkmf.rb:280:in `block (2 levels) in postpone'
	from /home/t/ruby-1.9.2-p136-1/lib/ruby/1.9.1/mkmf.rb:254:in `open'
	from /home/t/ruby-1.9.2-p136-1/lib/ruby/1.9.1/mkmf.rb:280:in `block in postpone'
	from /home/t/ruby-1.9.2-p136-1/lib/ruby/1.9.1/mkmf.rb:254:in `open'
	from /home/t/ruby-1.9.2-p136-1/lib/ruby/1.9.1/mkmf.rb:276:in `postpone'
	from /home/t/ruby-1.9.2-p136-1/lib/ruby/1.9.1/mkmf.rb:692:in `checking_for'
	from /home/t/ruby-1.9.2-p136-1/lib/ruby/1.9.1/mkmf.rb:796:in `have_func'
	from extconf.rb:50:in `<main>'

Gem files will remain installed in /home/t/ruby-1.9.2-p136-1/lib/ruby/gems/1.9.1/gems/mysql-2.8.1 for inspection.
Results logged to /home/t/ruby-1.9.2-p136-1/lib/ruby/gems/1.9.1/gems/mysql-2.8.1/ext/mysql_api/gem_make.out
You need to check mkmf.log which is in the same folder as gem_make.out is in.  In my case, mkmf.log is in /home/t/ruby-1.9.2-p136-1/lib/ruby/gems/1.9.1/gems/mysql-2.8.1/ext/mysql_api/ 
Read mkmf.log, if you see something similar to below: 
/usr/bin/ld: skipping incompatible /usr/lib/ when searching for -lz
/usr/bin/ld: skipping incompatible /usr/lib/libz.a when searching for -lz
/usr/bin/ld: cannot find -lz
collect2: ld returned 1 exit status
It means you have an incompatible zlib-devel binary.  In case, the 32-bit zlib-devel is installed, but not the 64 bits.  Run following command to fix it:

yum erase zlib-devel
yum install zlib-devel