Compiling error with SCO OpenServer(TM) Release 5

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Hi,

I 've try to install rsync under SCO OpenServer.
I obtain this error :
/tmp/rsync/rsync-2.6.0 : make
        cc -I. -I. -g -DHAVE_CONFIG_H -I./popt  -c rsync.c -o rsync.o
"./rsync.h", line 371: warning: ANSI C behavior differs; not modifying typedef with "unsigned"
"./rsync.h", line 371: warning: syntax requires ";" after last struct/union member
"./rsync.h", line 371: error: Syntax error before or at: inode
"./rsync.h", line 373: warning: ANSI C behavior differs; not modifying typedef with "unsigned"
"./rsync.h", line 373: error: cannot recover from previous errors
*** Error code 1 (bu21)

Thanks in advance for your help.

Damien