Why STDLIB.H is missing
"stdlib.h", the standard include file for ANSI C, is not available on all
Athena workstations. The standard compiler on Athena is not ANSI
compiliant, and as such, doesn't have that header file available for it;
the stdio.h file defines the standard I/O functions, but does not have
everything that stdlib.h does.
Athena is not yet running a fully ANSI compliant system; there are several
other header files described in the standard that do not exist. To write a
program that will compile correctly on both ANSI and non-ANSI systems, put
this text at the top of your .c file:
#if defined(__STDC__) && !defined(__HIGHC__)
#include <stdlib.h>
#endif
The symbol __STDC__ is always defined by an ANSI C compiler, and that code
tells the compiler only to #include <stdlib.h> if it is defined, so it WILL
NOT be included on non-ANSI systems.
The functions that are declared in stdlib.h on an ANSI system are, for the
most part, available in libc.a (the library that is automatically linked with
every C program).
For more information on these issues, see the stock answers on "What C
COMPILERS are available" and "Differences between ANSI C and TRADITIONAL C".
Last Updated: 7/25/96
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