I am trying to port this old program. Why do I get undefined external errors for some library functions?

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Some old or semistandard functions have been renamed or replaced over the years;
if you need:/you should instead:
index
use strchr.
rindex
use strrchr.
bcopy
use memmove, after interchanging the first and second arguments.
bcmp
use memcmp.
bzero
use memset, with a second argument of 0.

2015-07-16, 870👍, 0💬

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I keep getting errors due to library functions being undefined, but I am including all the right header files.
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I am porting this program, and it calls a routine drand48, which my library doesnt have. What is it?
I am porting this program, and it calls a routine drand48, which my library doesnt have. What is it? drand48 is a Unix System V routine which returns floating point random numbers (presumably with 48 bits of precision) in the half-open interval [0, 1). (Its companion seed routine is srand48; neither... 2015-07-20, 884👍, 0💬

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