ayuda con allegro

Hola necesito ayuda con allegro tengo all403 y todo lo descomprimo y lo pongo en su respectivo lugar pero a la hora de compilarlo me sale un error en fli.c o algo parecido la version de windows q uso es 98 , si les sirve de ayuda esto es lo q me sale cuando lo compilo en simbolo respondan

Compiling Allegro for djgpp, optimised. Please wait...
gcc -DALLEGRO_SRC -Wall -Wno-unused -mcpu=pentium -O2 -funroll-loops -ffast-math
-fomit-frame-pointer -I. -I./include -o obj/djgpp/alleg/fli.o -c src/fli.c
`-mcpu=' is deprecated. Use `-mtune=' or '-march=' instead.
src/fli.c: In function 'do_fli_256_color':
src/fli.c:320: error: invalid lvalue in increment
src/fli.c:334: error: invalid lvalue in assignmen
src/fli.c: In function 'do_fli_delta':
src/fli.c:365: error: invalid lvalue in increment
src/fli.c:370: error: invalid lvalue in increment
src/fli.c:380: error: invalid lvalue in increment
src/fli.c:394: error: invalid lvalue in increment
src/fli.c:400: error: invalid lvalue in assignmen
src/fli.c:410: error: invalid lvalue in assignmen
src/fli.c:412: error: invalid lvalue in increment
src/fli.c: In function 'do_fli_color':
src/fli.c:436: error: invalid lvalue in increment
src/fli.c:450: error: invalid lvalue in assignmen
src/fli.c: In function 'do_fli_lc':
src/fli.c:480: error: invalid lvalue in increment
src/fli.c:481: error: invalid lvalue in increment
src/fli.c:501: error: invalid lvalue in increment
src/fli.c:507: error: invalid lvalue in assignmen
src/fli.c:517: error: invalid lvalue in assignmen
src/fli.c: In function 'do_fli_brun':
src/fli.c:569: error: invalid lvalue in increment
src/fli.c:576: error: invalid lvalue in assignmen
src/fli.c:585: error: invalid lvalue in assignmen
src/fli.c:597: error: invalid lvalue in increment
src/fli.c:604: error: invalid lvalue in assignmen
src/fli.c:613: error: invalid lvalue in assignmen
src/fli.c: In function '_fli_read_header':
src/fli.c:654: error: invalid lvalue in increment
src/fli.c:655: error: invalid lvalue in increment
src/fli.c:656: error: invalid lvalue in increment
src/fli.c:657: error: invalid lvalue in increment
src/fli.c:658: error: invalid lvalue in increment
src/fli.c:659: error: invalid lvalue in increment
src/fli.c:660: error: invalid lvalue in increment
src/fli.c:661: error: invalid lvalue in increment
src/fli.c:662: error: invalid lvalue in increment
src/fli.c:663: error: invalid lvalue in increment
src/fli.c: In function '_fli_read_frame':
src/fli.c:680: error: invalid lvalue in increment
src/fli.c:681: error: invalid lvalue in increment
src/fli.c:682: error: invalid lvalue in increment
src/fli.c: In function '_fli_parse_chunk':
src/fli.c:697: error: invalid lvalue in increment
src/fli.c:698: error: invalid lvalue in increment
make.exe: *** [obj/djgpp/alleg/fli.o] Error 1

A mi me parece q es un problema a la hora de compilar fli.c