NAS newb: SPARC apps/compiling?

Managed to setup a compiler on the NAS and compile this little app but have a few warnings during the process:

nas:/usr/src/ps3netsrv# make
g++  -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -c -o main.o main.cpp
main.cpp: In function `int process_open_cmd(client_t*, netiso_open_cmd*)':
main.cpp:378: warning: converting of negative value `-1' to `long long unsigned
   int'
main.cpp: In function `int process_create_cmd(client_t*, netiso_create_cmd*)':
main.cpp:588: warning: converting of negative value `-1' to `unsigned int'
main.cpp: In function `int process_open_dir_cmd(client_t*,
   netiso_open_dir_cmd*)':
main.cpp:710: warning: converting of negative value `-1' to `unsigned int'
main.cpp: In function `int process_read_dir_entry_cmd(client_t*,
   netiso_read_dir_entry_cmd*, int)':
main.cpp:752: warning: converting of negative value `-1' to `long long unsigned
   int'
main.cpp:756: warning: converting of negative value `-1' to `long long unsigned
   int'
main.cpp:777: warning: converting of negative value `-1' to `long long unsigned
   int'
main.cpp:781: warning: converting of negative value `-1' to `long long unsigned
   int'
main.cpp:800: warning: converting of negative value `-1' to `long long unsigned
   int'
main.cpp:804: warning: converting of negative value `-1' to `long long unsigned
   int'
main.cpp:871: warning: converting of negative value `-1' to `long long unsigned
   int'
main.cpp:871: warning: converting of negative value `-1' to `long long unsigned
   int'
main.cpp: In function `int process_stat_cmd(client_t*, netiso_stat_cmd*)':
main.cpp:1141: warning: converting of negative value `-1' to `long long
   unsigned int'
gcc -Wall -I. -std=gnu99 -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -mcpu=v7 -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -c -o compat.o compat.c
g++  -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=32  -c -o File.o File.cpp
g++  -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=32  -c -o VIsoFile.o VIsoFile.cpp
gcc -Wall -I. -std=gnu99 -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -mcpu=v7 -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -L.   -L.  -o ps3netsrv main.o compat.o File.o VIsoFile.o -lstdc++ -lpthread

Anyone know how to fix those warnings as it seems the app doesn't work correctly when launched.

I can attach the source if anyone needs it?