Sometimes extracting a zip file using the unzip command may result in the “skipping: need PK compat. v4.5″ error message.
PHP Code:
    # unzip
       skipping  need PK compatv4.5 (can do v2.1
This is due to the file been compressed with the latest version of PKZIP which the unzip command cannot handle. The solution is to install p7zip package which can handle the files compressed using PKZIP.

Download the latest version of p7zip:

PHP Code:
    # wget\
Extract the file

PHP Code:
    # tar -jxf p7zip_9.20.1_x86_linux_bin.tar.bz2 
goto the extracted directory and run the installer

PHP Code:
    # ./ 
This will install the ’7za’ command on your server using which the zip file can be extracted
PHP Code:
    # 7za x
     Extracting  filename
     Everything is Ok