Query of type of memcpy (and sys_errlist) on Cygwin

[Tatsuro MATSUOKA <tmacchant2@yahoo.co.jp>]

Hello
The topic was discussed on gnuplot mailing list.
http://gnuplot.10905.n7.nabble.com/stdfn-h-error-conflicting-types-for-memcopy-and-sys-errlist-on-Cygwin-build-td20061.html
Frorm discussion there (the topic is now pending.) ,
I decided ask here.
In compling gnuplot I have met errors:
../../gnuplot/src/stdfn.h:67:8: error: conflicting types for 'memcpy' 
 char * memcpy __PROTO((char *, char *, size_t)); 

../../gnuplot/src/stdfn.h:171:14: error: conflicting types for 'sys_errlist' 
 extern char *sys_errlist[]; 

Ethan A Merritt suggested in the gnuplot mailing list that:
Anyhow, the correct typing for memcpy is: 
   void *memcpy(void *,  const void *,  size_t);
I have complied many times this source but I have not met such kinds of errors.
(Today I have cleanly installed Cygwin because I have cleanly install windows 10)

Any suggestions?
Tatsuro


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