Apparently, modplugline segfaults on some computers. This seems to be an issue with some soundcards...(with flaky OSS drivers???)
Find the two lines that read :
ioctl(sndfd, SNDCTL_DSP_GETOSPACE, &buffinf);
and replace it by
This will work for now. If it skips or tends to freeze the player display, change the 20000 value to something else.