[BioC] Keep getting warning messages of package 'XYZ' was built under R version 2.8.1

[Daren Tan]

I just installed another bioconductor package "seqinr". I only noticed the warning message today, and fear that my R or bioconductor is broken. Please give me some assurance it is working fine. I dread to reinstall R and bioconductor again. 
 
> library("seqinr")
Warning message:
package 'seqinr' was built under R version 2.8.1 

> sessionInfo()
R version 2.8.0 (2008-10-20) 
i386-pc-mingw32 
locale:
LC_COLLATE=English_United States.1252;LC_CTYPE=English_United States.1252;LC_MONETARY=English_United States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252
attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     
other attached packages:
[1] seqinr_2.0-2
loaded via a namespace (and not attached):
[1] tools_2.8.0