panther ~/src/pacman master
@ echo $PS4
+\e[34m${BASH_SOURCE:--}:\e[1m$LINENO\e[0m:${FUNCNAME:+\e[33m$FUNCNAME\e[0m}

panther ~/src/pacman master
@ cat ./autogen.sh
#!/bin/sh -xu

aclocal -I m4 --install
autoheader
automake --foreign
autoconf

panther ~/src/pacman master
@ ./autogen.sh
./autogen.sh: 1: LINENO: parameter not set
(returned 2)

panther ~/src/pacman master
@