The 0.9.19 version is out. Dependencies on libsysfs have been removed. I wrote a simple patch to allow the ext4 volumes mounting. Proposed ebuild and patch will follow. Reproducible: Always Steps to Reproduce:
Created attachment 187691 [details, diff] proposed patch to add ext4 support
Created attachment 187693 [details] proposed pmount-0.9.19.ebuild
bumped. Thanks for reporting.