Informix ISQL on Redhat DELETE and ESCAPE key

I installed Informix SQL on redhat. I do a "stty intr ^?" to set the DEL key as the interrupt key. I set TERMCAP=$INFORMIXDIR/etc/termcap When I run a form: 1) the DELETE key work only one time, after that nothing append. 2) the ESCAPE key need to be hit twice to respond. I try 7.31 and 7.32 with the same result. Isql need libncurses.so.4, I had the link it to libncurses.so.5. I tried it on Redhat Enterprise 3 ES with EM64T extention and on another without EM64T. Thanks for help, Jean-Guy Charron