.libPaths()

Hello
I use the function .libPaths()

.libPaths()

[1] "/usr/local/lib/R/library"

.libPaths(c("/usr/local/lib/myRlib","/usr/local/lib/library"))
.libPaths()

[1] "/usr/local/lib/R/library"

but it simply does not pick up the new path. Can anybody help?
(The problem originates from the inability to install packages 
into /usr/local/lib/R/library, running R under linux suse 9.3)

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Sebastian Leuzinger