Hello,
thanks for greating this nice peace of software.
it is THE reason why i still prefer ext3 over ext4 X-D (while ext4 being atleast 10% faster... who cares about speed if you can't recover files that got deleted by a mad command)
i tested it with the latest (2018-03-04) available kernel under CentOS7 while there is no official *.rpm build available i used this one: http://ftp.tu-chemnitz.de/pub/linux/dag/redhat/el7/en/x86_64/rpmforge/RPMS/foremost-1.5.7-1.el7.rf.x86_64.rpm
which installed fine... but was not able to extundelete a 5TB large RAID10 with ext4, ext3 worked well!
full error message her:
http://dwaves.de/2017/07/06/gnu-linux-undelete-ext3-vs-ext4/
... i stick to ext3... i just hope it survives 2030 X-D