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For the spirit of the LORD fills the world,
all-embracing, and knows what man says.
Wisdom 1:7
#if HAVE_SYS_WAIT_H
# include <sys/wait.h>
#endif
Implication. If p then q.
[math] { p \; \Rightarrow \; q } [/math]
If HAVE_SYS_WAIT_H is true (nonzero value)
then compile the following line(compilation of #include <sys/wait.h>)
will be done.
http://www.cprogramming.com/tutorial/cpreprocessor.html