RC-20200: Fatal: Could not find Unzip. At this time only Native UnZip 5.X is supported
                                                 Last update (2012-06-18 18:04:30)
                                                                                                                   Date added (2012-06-16 14:05:52)

Summary
During the post cloning steps at the dbTier of an E-Business Suite R12.1.3 i get the error:

RC-20200 Fatal: Could Not Find Unzip. At This Time Only Native UnZip 5.X is Supported

I check my unzip version:
$ unzip -version
$ which uzip
And i found out that i have Unzip version 6!

But at the "source" system i do have the version UnZip 5.52

Workaround:
Copy from the "source" system the unzip version 5.52 and put it under "target" system:
/usr/bin/unzip
/system_base_directory/db/tech_st/11.2.0/bin/unzip

MyOracle Support offers a solution with a patch:
RC-20200: Fatal: Could not find Unzip. At this time only Native UnZip 5.X is supported [ID 1410514.1]

Tip:
After solving the issue with unzip and running again the dbTier post cloning steps you might get the error:

[AutoConfig Error Report]
The following report lists errors AutoConfig encountered during each
phase of its execution.  Errors are grouped by directory and phase.
The report format is:
          

  [INSTANTIATE PHASE]
  AutoConfig could not successfully instantiate the following files:
    Directory: /u01/saudi_arabia_ar/db/tech_st/11.2.0/appsutil/install/PRODAR_ebsdbprd
      adcrdb.sh               INSTE8


AutoConfig is exiting with status 1

RC-50014: Fatal: Execution of AutoConfig was failed
Raised by oracle.apps.ad.clone.ApplyDBTechStack

The problem now is that the file:
/u01/saudi_arabia_ar/db/tech_st/11.2.0/appsutil/template/adcrdb.sh is Deleted from the first failed clone process.

Workaround: Copy again all the template directory from the "source" system and put it to the "target" system.
Run again $ perl adcfgclone.pl dbTier