  Availability of DEC C routines on earlier releases 
 The Question is:
 
&lt;STDIO.H&gt; "popen" function in previous versions.
 
In a fairly recent version of the "DEC C"
compiler, there is a function called "popen".
Initial development of a program was done on
V7.1-1H1, we are unable to compile on a
previous VMS version V6.2-1H3 because it's
compiler does not include this function. Was
there an equivalent function in previous revs
of the compiler?
 
DEC C V5.5-002 on OpenVMS Alpha V7.1-1H1
 
__FILE_ptr32 popen(const char *__command, const char *__mode);
 
DEC C V5.0-003 on OpenVMS Alpha V6.2-1H3
 
[NONE]
 
 
 The Answer is:
 
  popen is available in OpenVMS V7.0 and later releases.
 
  DEC C V5.6 and later compilers include the "backport" library,
  which allows routines added in more recent OpenVMS releases to
  be used on programs to be compiled and used on earlier OpenVMS
  releases.
 
