Missing dependency

[Félix C. Morency]

Hi all,

You should add pkg-config to the list of dependencies in the README. It is
required if you want to build with Lua support. Also, it might be a good
idea to check for pkg-config presence in the Makefile. For example, if you
try

  > make LUA_IMPLEMENTATION=JIT

with LuaJIT installed and pkg-config not installed, the error message will
be

  LuaJIT specified via LUA_IMPLEMENTATION=JIT, but library could not be
found.

which is misleading.

Thanks,
-- 
Félix C. Morency, M.Sc.
Plateforme d’analyse et de visualisation d’images
Centre Hospitalier Universitaire de Sherbrooke
Centre de recherche clinique Étienne-Le Bel
Local Z5-3031 | 819.346.1110 ext 16634
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