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POSIX compatibility code
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This code exists to work around some common POSIX compatibility issues.
POSIX specifies that if the first line of a Makefile is ".POSIX:" then the
Makefile should be processed according to POSIX rules, including with CC=c99.
Further, c99 is required to understand the -lrt and -lxnet options (and ignore
them if the routines they specify linkage for are already in the standard C
library). Unfortunately some systems fail or one or both of these accounts.
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