libdevmapper-dev - 2:1.02.185-2 main

The Linux Kernel Device Mapper is the LVM (Linux Logical Volume Management)
Team's implementation of a minimalistic kernel-space driver that handles
volume management, while keeping knowledge of the underlying device layout
in user-space. This makes it useful for not only LVM, but software raid,
and other drivers that create "virtual" block devices.
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This package contains the (user-space) header files for accessing the
device-mapper; it allow usage of the device-mapper through a clean,
consistent interface (as opposed to through kernel ioctls).