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chmod: changing permissions of '/home/hornik/tmp/R.check/r-patched-gcc/Work/build/Packages/whitebox/WBT/whitebox_tools': Read-only file system
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chmod: changing permissions of '/home/hornik/tmp/R.check/r-patched-gcc/Work/build/Packages/whitebox/WBT/whitebox_tools': Read-only file system
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chmod: changing permissions of '/home/hornik/tmp/R.check/r-patched-gcc/Work/build/Packages/whitebox/WBT/whitebox_tools': Read-only file system