EDIT :
Many thanks to user20650, whose answer solved this problem. But if anyone knows why the .Rprofile file affects lme4 install on Ubuntu 12.04, please advise because I'd really like to know.
Original post :
I'm attempting to install the doBy package and am having some issues.  It depends on lme4, which for some reason is not compiling from any source I've tried so far.  I've been to a few links on SO including this one and haven't had any success.
Here are snippets of the errors I'm getting on install.  I tried it three different ways, as noted below.  Anyone know if something's up with lme4?
Attempt 1:
> install.packages('doBy')
# ...
# ERROR: compilation failed for package ‘lme4’
# * removing ‘/home/richard/R/x86_64-pc-linux-gnu-library/3.1/lme4’
# Warning in install.packages :
#   installation of package ‘lme4’ had non-zero exit status
# 
# Successfully loaded .Rprofile at Wed May 21 13:33:34 2014 
# ERROR: dependency ‘lme4’ is not available for package ‘doBy’
# * removing ‘/home/richard/R/x86_64-pc-linux-gnu-library/3.1/doBy’
# Warning in install.packages :
#   installation of package ‘doBy’ had non-zero exit status
Attempt 2:
> install.packages("lme4",repos = "http://r-forge.r-project.org")
# Installing package into ‘/home/richard/R/x86_64-pc-linux-gnu-library/3.1’
# (as ‘lib’ is unspecified)
# Warning in install.packages :
#   package ‘lme4’ is not available (for R version 3.1.0)
Attempt 3:
> install_github(repo = 'lme4/lme4', username = 'stevencarlislewalker')

Running Ubuntu 12.04 LTS
> version
# _                           
# platform       x86_64-pc-linux-gnu         
# arch           x86_64                      
# os             linux-gnu                   
# system         x86_64, linux-gnu           
# status                                     
# major          3                           
# minor          1.0                         
# year           2014                        
# month          04                          
# day            10                          
# svn rev        65387                       
# language       R                           
# version.string R version 3.1.0 (2014-04-10)
# nickname       Spring Dance