error message when adding snippets package to my R library - r

I'm trying to make use of the R package "snippets." So, I seem to have installed it ok:
> install.packages("snippets", , "http://rforge.net/")
But then, when I go to add it to my library, I get the following error message:
> library(snippets)
Error: package or namespace load failed for ‘snippets’ in loadNamespace(i, c(lib.loc, .libPaths()), versionCheck = vI[[i]]):
there is no package called ‘png’
I'm lost after that. Anyone know what to do?
Jerry

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