Error installing ruby 1.9.3 from rvm on ubuntu 11.04

Error

ruby-1.9.3-p0 - #extracted to /home/bhaarat/.rvm/src/ruby-1.9.3-p0

Fetching yaml-0.1.4.tar.gz to /home/bhaarat/.rvm/archives Extracting yaml-0.1.4.tar.gz to /home/bhaarat/.rvm/src Configuring yaml in /home/bhaarat/.rvm/src/yaml-0.1.4.

Compiling yaml in /home/bhaarat/.rvm/src/yaml-0.1.4. ERROR: Error running 'make ', please read /home/bhaarat/.rvm/log/ruby-1.9.3-p0/yaml/make.log Installing yaml to /home/bhaarat/.rvm/usr ERROR: Error running 'make install', please read /home/bhaarat/.rvm/log/ruby-1.9.3-p0/yaml/make.install.log

make.log

[2012-01-12 10:49:57] make CDPATH="${ZSH_VERSION+.}:" && cd . && /bin/bash /home/bhaarat/.rvm/src/yaml-0.1.4/config/missing --run aclocal-1.11 configure.ac:27: warning: AC_INIT: not a literal: YAML_BUGS cd . && /bin/bash /home/bhaarat/.rvm/src/yaml-0.1.4/config/missing --run automake-1.11 --foreign configure.ac:27: warning: AC_INIT: not a literal: YAML_BUGS src/Makefile.am:2: Libtool library used but `LIBTOOL' is undefined src/Makefile.am:2: The usual way to define `LIBTOOL' is to add `AC_PROG_LIBTOOL' src/Makefile.am:2: to `configure.ac' and run `aclocal' and `autoconf' again. src/Makefile.am:2: If `AC_PROG_LIBTOOL' is in `configure.ac', make sure src/Makefile.am:2: its definition is in aclocal's search path. make: *** [Makefile.in] Error 1 

I've removed all previous versions of ruby

% rvm list rubies rvm rubies