[Neko] Compiling from CVS on MacOS X

[ncruces]

Hi,

Compiling Neko's CVS in my system fails on libs/std/sys.c in function
sys_time with "CLK_TCK undeclared". This seems to be defined in
limits.h, so including it solves the issue.

Nuno Cruces

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Neko : One VM to run them all
(http://nekovm.org)