Hello, I got some error under SCO. Within some self written tasks I do a Runtime.getRuntime().exec(cmd); This fails with a IOException, message is: "Resource temporarily not availalbe" If I do the same in a self written class not related to ant I do not get the exeption. And, what is realy wired, I got another machine with the almost same system, and there it works. The only difference between the machines is, the working one uses jdk1.1.7A, the failure one jdk1.1.7B. Ant is a self compiled 1.3 release. Any suggestions except of changing the jdk ? thanks, mfg Frank