GForth 6.2 built on Mac Xcode troubles

Hello GForth experts,

I have inherited a 'hand-me-down' Dual G5 from my wife, the graphic
designer (ellyfox.com).  I of course had to install the newest Xcode
tools for the Leopard version of OS/X.  And of course I don't know
very much about C.   I have built GForth in the past using the command
line. (Even I can type 'make' :-)  )

So, I think... wouldn't it be neat if I could build GForth with Xcode
(uses GCC 4.0) .  So I did my best to put the appropriate files into
an Apple 'Standard Tool' project, which builds a command line app in
C.

I removed all "Arch" folder files except the ones for Power PC and 386
and here are the errors I get from file strerror.c  :


#include <errno.h>
#include <stdio.h>
 extern   char *sys_errlist[];
error: conflicting types for 'sys_errlist'

extern  int sys_nerr;
error: conflicting type qualifiers for 'sys_nerr'
< end errors>

I also get 19 warnings shown below:

Questions:
1. Can anybody help direct me to how to fix these errors? (looks like
conflict with stdio.h)
2. Can anybody tell me if these warnings are acceptable when compiling
GForth?

/Users/ellyfox/Mac gForthCLI/../gforth/gforth-0.6.2/engine/main.c:
482:2: warning: #warning You can ignore the warnings about clobbered
variables in go_forth
/Users/ellyfox/Mac gForthCLI/../gforth/gforth-0.6.2/engine/main.c: In
function 'flush_to_here':
/Users/ellyfox/Mac gForthCLI/../gforth/gforth-0.6.2/engine/main.c:830:
warning: pointer targets in passing argument 1 of '_sync_cache_range'
differ in signedness
/Users/ellyfox/Mac gForthCLI/../gforth/gforth-0.6.2/engine/main.c: In
function 'loader':
/Users/ellyfox/Mac gForthCLI/../gforth/gforth-0.6.2/engine/main.c:
1360: warning: pointer targets in passing argument 2 of 'relocate'
differ in signedness
/Users/ellyfox/Mac gForthCLI/../gforth/gforth-0.6.2/engine/main.c: In
function 'openimage':
/Users/ellyfox/Mac gForthCLI/../gforth/gforth-0.6.2/engine/main.c:
1401: warning: pointer targets in passing argument 1 of 'tilde_cstr'
differ in signedness
/Users/ellyfox/Mac gForthCLI/../gforth/gforth-0.6.2/engine/main.c:
482:2: warning: #warning You can ignore the warnings about clobbered
variables in go_forth
/Users/ellyfox/Mac gForthCLI/../gforth/gforth-0.6.2/engine/main.c:830:
warning: pointer targets in passing argument 1 of '_sync_cache_range'
differ in signedness
/Users/ellyfox/Mac gForthCLI/../gforth/gforth-0.6.2/engine/main.c:
1360: warning: pointer targets in passing argument 2 of 'relocate'
differ in signedness
/Users/ellyfox/Mac gForthCLI/../gforth/gforth-0.6.2/engine/main.c:
1401: warning: pointer targets in passing argument 1 of 'tilde_cstr'
differ in signedness

<more error explantions>
/Users/ellyfox/Mac gForthCLI/../gforth/gforth-0.6.2/engine/strerror.c:
24: error: conflicting types for 'sys_errlist'
/Developer/SDKs/MacOSX10.5.sdk/usr/include/stdio.h:274: error:
previous declaration of 'sys_errlist' was here
/Users/ellyfox/Mac gForthCLI/../gforth/gforth-0.6.2/engine/strerror.c:
25: error:  conflicting type qualifiers for 'sys_nerr'
/Developer/SDKs/MacOSX10.5.sdk/usr/include/stdio.h:273: error:
previous declaration of 'sys_nerr' was here
/Users/ellyfox/Mac gForthCLI/../gforth/gforth-0.6.2/engine/strerror.c:
24: error: conflicting types for 'sys_errlist'
/Developer/SDKs/MacOSX10.5.sdk/usr/include/stdio.h:274: error:
previous declaration of 'sys_errlist' was here
/Users/ellyfox/Mac gForthCLI/../gforth/gforth-0.6.2/engine/strerror.c:
25: error:  conflicting type qualifiers for 'sys_nerr'
/Developer/SDKs/MacOSX10.5.sdk/usr/include/stdio.h:273: error:
previous declaration of 'sys_nerr' was here

Build failed (2 errors, 19 warnings)

Appreciate any help

Thanks

Brian