If I create a VPC file with PDAL_wrench, then I try to open it with PDAL, it fails :

$ pdal_wrench build_vpc --output=test.vpc input.las
$ pdal translate test.vpc output.las
PDAL: Unable to open stream for '/./input.las' with error 'No such file or directory'

Why does PDAL add a "/" in front of the relative path ?
It I replace the relative path in test.vpc by an absolute path, it works.