Regarding compilation of coreutils.

[Sandeep Kumar Sah]

previously i edited ls.c to print "Hello World" before listing content in a
directory.
Now i have deleted the coreutils folder and everything underneath it.
I want to get the original version of ls command for which i am unable to
build the source file, it tells me that
"checking for a BSD-compatible install... /usr/local/bin/install -c
checking whether build environment is sane... configure: error: ls -t
appears to fail.  Make sure there is not a broken
  alias in your environment
configure: error: newly created file is older than distributed files!
Check your system clock"
Please help, i am unable to compile any source.