I had a similar problem installing lme4 on my mac in R 2.12.1. The information on this thread helped me troubleshoot the problem, but I arrived at a different solution. When I tried to load lme4 from the source as advised by one author, it failed and I got an error message regarding the package 'Matrix' (see below if you're interested). Before diving in on some of the other suggestions to deal with the Matrix issue, I simply got the 'Matrix' package I already had installed going, and then installed lme4 successfully.
library(Matrix)
install.packages("lme4")
That did the trick.
Andy
* installing *source* package ?Matrix? ...
** libs
*** arch - i386
sh: make: command not found
ERROR: compilation failed for package ?Matrix?
* removing ?/Users/darwin/Library/R/2.12/library/Matrix?
* installing *source* package ?lme4? ...
** libs
*** arch - i386
sh: make: command not found
ERROR: compilation failed for package ?lme4?
* removing ?/Users/darwin/Library/R/2.12/library/lme4?
The downloaded packages are in
?/private/var/folders/Ts/TsMLZGaEF3W3JOTfdmIGD++++TU/-Tmp-/RtmpAXhRpJ/downloaded_packages?
Warning messages:
1: In install.packages("lme4", type = "source") :
installation of package 'Matrix' had non-zero exit status
2: In install.packages("lme4", type = "source") :
installation of package 'lme4' had non-zero exit status
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