build problem on OpenBSD 2.6

[Tanaka Akira <akr@m17n.org>]

On OpenBSD 2.6, zsh-3.1.7-pre-1 is failed to build.

...
gcc -c -I.  -DHAVE_CONFIG_H -DMODULE -Wall -Wno-implicit -Wmissing-prototypes -O2 -fpic -o zftp..o zftp.c
In file included from /usr/include/netdb.h:75,
                 from zftp.c:57:
/usr/include/sys/param.h:182: warning: `isset' redefined
../../Src/zsh.h:1438: warning: this is the location of the previous definition
zftp.c:571: macro `isset' used with just one arg
zftp.c:1717: macro `isset' used with just one arg
zftp.c:1732: macro `isset' used with just one arg
*** Error code 1

This is because /usr/include/sys/param.h defines isset as following,

/usr/include/sys/param.h:182: #define isset(a,i)      ((a)[(i)/NBBY] & (1<<((i)%NBBY)))

and zsh.h is included *before* param.h.  If zsh.h is included *after*
param.h, there should be no problem because zsh.h undefine isset
before defining.  So I tried to move #include "zftp.mdh" and
"zftp.pro"' to after including sytem headers as:
(sys/types.h is needed for sys/socket.h.)

| --- zftp.c.0	Sun Apr 30 21:52:51 2000
| +++ zftp.c	Sun Apr 30 21:57:20 2000
| @@ -50,9 +50,7 @@
|  struct zftp_session;
|  typedef struct zftp_session *Zftp_session;
|  
| -#include "zftp.mdh"
| -#include "zftp.pro"
| -
| +#include <sys/types.h>
|  #include <sys/socket.h>
|  #include <netdb.h>
|  #include <netinet/in_systm.h>
| @@ -61,6 +59,9 @@
|  #include <arpa/inet.h>
|  /* it's a TELNET based protocol, but don't think I like doing this */
|  #include <arpa/telnet.h>
| +
| +#include "zftp.mdh"
| +#include "zftp.pro"
|  
|  /*
|   * We use poll() in preference to select because some subset of manuals says

But this causes another problem.

gcc -c -I.  -DHAVE_CONFIG_H -DMODULE -Wall -Wno-implicit -Wmissing-prototypes -O2 -fpic -o zftp..o zftp.c
In file included from ../../Src/zsh.mdh:16,
                 from zftp.mdh:15,
                 from zftp.c:63:
../../Src/zsh.h:212: syntax error before `253'
...

Because /usr/include/arpa/telnet.h defines `DO' as a macro and zsh.h
defined `DO' as enum symbol.

/usr/include/arpa/telnet.h:47:
#define       DO      253             /* please, you use option */

zsh.h:212:
    DO,         /* do        */

So, finally I succeed to compile zsh with following modification, but
I think this is bit ugly.

| --- zftp.c.0	Sun Apr 30 21:52:51 2000
| +++ zftp.c	Sun Apr 30 22:11:05 2000
| @@ -50,15 +50,17 @@
|  struct zftp_session;
|  typedef struct zftp_session *Zftp_session;
|  
| -#include "zftp.mdh"
| -#include "zftp.pro"
| -
| +#include <sys/types.h>
|  #include <sys/socket.h>
|  #include <netdb.h>
|  #include <netinet/in_systm.h>
|  #include <netinet/in.h>
|  #include <netinet/ip.h>
|  #include <arpa/inet.h>
| +
| +#include "zftp.mdh"
| +#include "zftp.pro"
| +
|  /* it's a TELNET based protocol, but don't think I like doing this */
|  #include <arpa/telnet.h>
|  
-- 
Tanaka Akira