compile problem with lout

[Terrence M. Brannon]

Using gcc 2.6.3 and gcc 2.7.0 I had the following error in compiling
lout:

gcc -DOS_UNIX=1                                  -DOS_DOS=0                     
                 -DOS_MAC=0                                      
-DFONT_DIR=\"/home/hyla-01/brannon/pkg/lib/font\"                               
-DEVEC_DIR=\"/home/hyla-01/brannon/pkg/lib/evec\"                               
-DINCL_DIR=\"/home/hyla-01/brannon/pkg/lib/include\"                    
-DDATA_DIR=\"/home/hyla-01/brannon/pkg/lib/data\"                               
-DHYPH_DIR=\"/home/hyla-01/brannon/pkg/lib/hyph\"                               
-DLOCALE_DIR=\"/home/hyla-01/brannon/pkg/lib/locale\"                   
-DCHAR_IN=1                                     -DCHAR_OUT=0                    
                -DLOCALE_ON=0                                   -DDEBUG_ON=0    
                                        -DASSERT_ON=1   -target sun4 -c  z41.c
z41.c: In function `AppendToFile':
z41.c:449: `SEEK_END' undeclared (first use this function)
z41.c:449: (Each undeclared identifier is reported only once
z41.c:449: for each function it appears in.)
*** Error code 1
make: Fatal error: Command failed for target `z41.o'
rana.usc.edu:/tmp_mnt/auto/hyla-01/brannon/pkg/lout.3.06