It is not Nim's problem.
>From the `dlopen` doco, you definitely need to either use `ldconfig` or set
>`LD_LIBRARY_PATH`, because `dlopen` does not check `/usr/local/lib` by default:
o (ELF only) If the executable file for the calling program
contains a DT_RPATH tag, and does not contain a DT_RUNPATH tag,
then the directories listed in the DT_RPATH tag are searched.
o If, at the time that the program was started, the environment
variable LD_LIBRARY_PATH was defined to contain a colon-separated
list of directories, then these are searched. (As a security
measure, this variable is ignored for set-user-ID and set-group-
ID programs.)
o (ELF only) If the executable file for the calling program
contains a DT_RUNPATH tag, then the directories listed in that
tag are searched.
o The cache file /etc/ld.so.cache (maintained by ldconfig(8)) is
checked to see whether it contains an entry for filename.
o The directories /lib and /usr/lib are searched (in that order).
