When missing bison, you don't get an obvious "bison: file not found" error anymore. Instead, you get the obscure: In file included from /tmp/libreswan-3.13dr1/lib/libipsecconf/confread.c:46:0: /tmp/libreswan-3.13dr1/include/ipsecconf/parser.h:22:49: fatal error: parser.tab.h: No such file or directory Could that be unfixed? :) Paul