root@:/usr/src/portsentry_beta# make linux
SYSTYPE=linux 
Making 
cc -O -Wall -DLINUX -DSUPPORT_STEALTH -o ./portsentry ./portsentry.c \
        ./portsentry_io.c ./portsentry_util.c 
./portsentry.c: In function 'PortSentryModeTCP':
./portsentry.c:1187:8: warning: pointer targets in passing argument 3 of 'accept' differ in signedness [-Wpointer-sign]
        &length);
        ^
In file included from /usr/include/netinet/in.h:23:0,
                 from /usr/include/netdb.h:27,
                 from ./portsentry.h:30,
                 from ./portsentry.c:20:
/usr/include/sys/socket.h:243:12: note: expected 'socklen_t * restrict {aka unsigned int * restrict}' but argument is of type 'int *'
 extern int accept (int __fd, __SOCKADDR_ARG __addr,
            ^
./portsentry.c: In function 'PortSentryModeUDP':
./portsentry.c:1384:39: warning: pointer targets in passing argument 6 of 'recvfrom' differ in signedness [-Wpointer-sign]
          (struct sockaddr *) &client, &length) < 0)
                                       ^
In file included from /usr/include/netinet/in.h:23:0,
                 from /usr/include/netdb.h:27,
                 from ./portsentry.h:30,
                 from ./portsentry.c:20:
/usr/include/sys/socket.h:174:16: note: expected 'socklen_t * restrict {aka unsigned int * restrict}' but argument is of type 'int *'
 extern ssize_t recvfrom (int __fd, void *__restrict __buf, size_t __n,
                ^
./portsentry.c: In function 'Usage':
./portsentry.c:1584:11: warning: missing terminating " character
   printf ("Copyright 1997-2003 Craig H. Rowland <craigrowland at users dot 
           ^
./portsentry.c:1584:3: error: missing terminating " character
   printf ("Copyright 1997-2003 Craig H. Rowland <craigrowland at users dot 
   ^
./portsentry.c:1585:1: error: 'sourceforget' undeclared (first use in this function)
 sourceforget dot net>\n");
 ^
./portsentry.c:1585:1: note: each undeclared identifier is reported only once for each function it appears in
./portsentry.c:1585:14: error: expected ')' before 'dot'
 sourceforget dot net>\n");
              ^
./portsentry.c:1585:14: error: stray '\' in program
./portsentry.c:1585:24: warning: missing terminating " character
 sourceforget dot net>\n");
                        ^
./portsentry.c:1585:14: error: missing terminating " character
 sourceforget dot net>\n");
              ^
./portsentry.c:1595:1: error: expected ';' before '}' token
 }
 ^
./portsentry_io.c: In function 'ConfigTokenRetrieve':
./portsentry_io.c:321:39: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
        if ((strstr (buffer, token) != (char) NULL) && 
                                       ^
./portsentry_io.c:321:36: warning: comparison between pointer and integer
        if ((strstr (buffer, token) != (char) NULL) && 
                                    ^
./portsentry_io.c:324:34: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
     if (strstr (buffer, "\"") == (char) NULL)
                                  ^
./portsentry_io.c:324:31: warning: comparison between pointer and integer
     if (strstr (buffer, "\"") == (char) NULL)
                               ^
./portsentry_io.c: In function 'IsBlocked':
./portsentry_io.c:670:44: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
  if((ipOffset = strstr(buffer, target)) != (char) NULL)
                                            ^
./portsentry_io.c:670:41: warning: comparison between pointer and integer
  if((ipOffset = strstr(buffer, target)) != (char) NULL)
                                         ^
./portsentry_io.c: In function 'SubstString':
./portsentry_io.c:727:33: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
    if (strstr (target, find) == (char) NULL)
                                 ^
./portsentry_io.c:727:30: warning: comparison between pointer and integer
    if (strstr (target, find) == (char) NULL)
                              ^
Makefile:102: recipe for target 'linux' failed
make: *** [linux] Error 1

./portsentry.c: In function 'Usage':
./portsentry.c:1584:11: warning: missing terminating " character
   printf ("Copyright 1997-2003 Craig H. Rowland <craigrowland at users dot 
           ^
./portsentry.c:1584:3: error: missing terminating " character
   printf ("Copyright 1997-2003 Craig H. Rowland <craigrowland at users dot 
   ^
./portsentry.c:1585:1: error: 'sourceforget' undeclared (first use in this function)
 sourceforget dot net>\n");