http cern BUILD error

When running BUILD on a Sun ULTRA with Solaris 2.5 I get this
error. Does anyone know what I can do to fix this?  - TIA

gcc -c -o ../../Library/sun4-sol2/HTParse.o -Wall -g -D__svr4__ -DNO_GETWD -DHAS_GETCWD -DPOSIXWAIT  -I../../Library/Implementation/ -DSOCKS ../../Library/Implementation/HTParse.c
In file included from ../../Library/Implementation/tcp.h:762,
                 from ../../Library/Implementation/HTAAUtil.h:35,
                 from ../../Library/Implementation/HTAccess.h:148,
                 from ../../Library/Implementation/HTTCP.h:13,
                 from ../../Library/Implementation/HTParse.c:10:
/usr/include/arpa/inet.h:68: sys/bitypes.h: No such file or directory
/usr/include/arpa/inet.h:72: sys/cdefs.h: No such file or directory
In file included from ../../Library/Implementation/tcp.h:765,
                 from ../../Library/Implementation/HTAAUtil.h:35,
                 from ../../Library/Implementation/HTAccess.h:148,
                 from ../../Library/Implementation/HTTCP.h:13,
                 from ../../Library/Implementation/HTParse.c:10:
/usr/include/netdb.h:66: sys/bitypes.h: No such file or directory
/usr/include/netdb.h:68: sys/cdefs.h: No such file or directory
*** Error code 1
make: Fatal error: Command failed for target `../../Library/sun4-sol2/HTParse.o'
Current working directory /usr/local/src/WWW/Library/sun4-sol2
*** Error code 1
make: Fatal error: Command failed for target `../../Library/sun4-sol2/libwww.a'
WWW build for  sun4-sol2  done. status =  1

Received on Thursday, 20 June 1996 17:28:45 UTC