[R] mysterious error on compile R 2.3.1

[Dylan Beaudette]

Getting a very strange error with a new install of R from source on x86;

make[3]: Leaving directory `/tmp/R.INSTALL.r20887/cluster/src'
** R
** data
**  moving datasets to lazyload DB
Error in factor(c(1, 2, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1),  : 
        invalid labels; length 2 should be 1 or 1
Execution halted
ERROR: lazydata failed for package 'cluster'
** Removing '/home/dylan/src/R-2.3.1/library/cluster'
make[2]: *** [cluster.ts] Error 1
make[2]: Leaving directory `/home/dylan/src/R-2.3.1/src/library/Recommended'
make[1]: *** [recommended-packages] Error 2
make[1]: Leaving directory `/home/dylan/src/R-2.3.1/src/library/Recommended'
make: *** [stamp-recommended] Error 2

note that i am using the GCC flags:
CFLAGS=-march=opteron -ffast-math
CXXFLAGS=-march=opteron -ffast-math

any ideas?

-- 
Dylan Beaudette
Soils and Biogeochemistry Graduate Group
University of California at Davis
530.754.7341