error when install from ports

[sonjaya]

my bsd box is :  freebsd 5.2 current i386 
 
 
>  here my detail insatll when i try install from ports
>  
> # /usr/ports/database/db42/
> #make 
> --cut--
> checking for strip... strip
> checking for strip... /usr/bin/strip
> checking for a BSD-compatible install... /usr/bin/install -c -o root 
-g wheel
> checking for C compiler default output... configure: error: C 
compiler cannot create executables
> configure:3687: checking for C compiler default output
> configure:3690: cc -O -pipe -mcpu=pentiumpro  -D_THREAD_SAFE  
-lpthread conftest.c  >&5
> /usr/bin/ld: cannot find -lpthread <-- hwo to solved this 

 
what should i do , because some friend told me to downgrade my freebsd to  4.10 , i can do that because my bsd box have been online and serve many comp.
 
thank's
 
 


SONJAYA