$ pacaur -Qs lib32-tdb
local/lib32-tdb 1.3.9-1
    A Trivial Database similar to GDBM but allows simultaneous commits (32-bit)
$ pacaur -Qs lib32-ldb
local/lib32-ldb 1.1.26-2
    A schema-less, ldap like, API and database

$ pacaur -S --asdeps lib32-ldb
:: Package(s) lib32-ldb not found in repositories, trying AUR...
:: resolving dependencies...
:: looking for inter-conflicts...

AUR Packages  (1) lib32-ldb-1.1.27-1

:: Proceed with installation? [Y/n] y
:: Retrieving package(s)...

[...]

Checking C prototype for getgrent_r                                               : not found
Checking for getgrouplist                                                         : ok
Checking for system tdb >= 1.3.10                                                 : not found
ERROR: System library tdb of version 1.3.10 not found, and bundling disabled
==> ERROR: A failure occurred in build().
    Aborting...
:: failed to build lib32-ldb package(s)