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For discussion of the package internals, see hackguide.html in the misc
directory.
Here are some -D options you might need to compile with.
The 'configure' script gets most other definitions right automatically.
-DHAVE_SIGACTION if the sigaction function is present
-DHAVE_USLEEP if the usleep function is present
-DSVR4_ACTION if (e.g., svr4) you need _POSIX_SOURCE to have sigaction
-DSVR4_TERMIO if (e.g., svr4) you need _POSIX_SOURCE to have termio
-DOPT_MVCUR if you want mvcur() to cost its actions or you have a
terminal that doesn't have direct cursor addressing.
There are several problems with strict POSIX systems so extra flags
or #define's may be needed.
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