-A test for compliance to POSIX.1-1990 tar specification. Needs
-the files ustar-all-quicktest.tar and quicktest.filelist. Apart
-from them, the `tartest' program from 'star' package is needed.
-This test may be run only with root privileges, so it is a good
-idea to test the contents of ustar-all-quicktest.tar before running
-it.
+This is a test for compliance to POSIX.1-1990 tar specification. It
+requires two files: ustar-all-quicktest.tar and quicktest.filelist,
+(they usually reside in star/tartest directory), and `tartest' program
+(also part of star distribution). The test must be run only with root
+privileges, so it is a good idea to test contents of
+ustar-all-quicktest.tar before running it.
+
+If `tartest' is not in your PATH, use TARTEST variable to specify its
+full file name. You may pass both STAR_TESTSCRIPTS and TARTEST
+variables as command line arguments to quicktest.sh, as shown in
+the example below:
+
+ ./quicktest.sh STAR_TESTSCRIPTS=testdir TARTEST=/path/to/tartest