liblmdb-dev 0.9.31-1 (i386 binary) in ubuntu mantic

 This package contains the development libraries, header files. Install
 lmdb-doc package for man pages.
 .
 Lighting Memory-Mapped Database (LMDB) is an ultra-fast, ultra-compact
 key-value embedded data store developed for the OpenLDAP Project. It uses
 memory-mapped files, so it has the read performance of a pure in-memory
 database while still offering the persistence of standard disk-based
 databases, and is only limited to the size of the virtual address space, (it
 is not limited to the size of physical RAM).