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The "-k" option tells gzip to keep the original files intact and is an alternative to `gzip -c file > file.gz`. It was implemented in 2013: http://git.savannah.gnu.org/cgit/gzip.git/commit/?id=0192f02 There are a few popular operating systems (ie, Red Hat 7, Debian Wheezy) whose version of gzip does not have the "-k" option. Compiling assets breaks on these operating systems. Using "-c" instead ensures that it works even with older versions of gzip.