Solution : https://service.sap.com/sap/support/notes/1541772 (SAP Service marketplace login required)
Key words : 
===> call qp2term                        ===> cd /tmp/netweaver73_kernelinst/     51039310/data_units/nw730_im_os400_ppc64_db4                        ===> sapinst -nogui guiserver_dialog_port=21212, \> \\as0012\rootbin\tmp\netweaver73_kernelinst\    51039310\data_units\nw730_sapinstgui_windows_i386\     sapinstgui, 'touch /usr/sap/gtw/sys/profile/default, '/tmp/netweaver73_kernelinst/51039310/data_units/k_720_n_os400_ppc64/db4/sapexedb, /sapmnt/<sid>/exe/nuc/as400_pase_64/xdncontrol, '/tmp/netweaver73_kernelinst/51039310/data_units/k_720_n_os400_ppc64/dbindep', \\as0012\rootbin\tmp\netweaver73_kernelinst, 'touch /usr/sap/gtw/, symptom easy sap gateway install, 'touch /usr/sap/<sid>/
Related Notes : 
       
| 1257635 | DB4: DBSL Direct Drive for DB2 for IBM i (DB2/400) |