File list (Check if you may need any files):
flex-2.5.4
..........\.descr
..........\build
..........\ccl.c
..........\conf.in
..........\configure
..........\configure.in
..........\configure.minix
..........\COPYING
..........\Debug
..........\.....\main.pch
..........\.....\vc60.idb
..........\.....\vc60.pdb
..........\dfa.c
..........\ecs.c
..........\flex.1
..........\flex.skl
..........\flexdef.h
..........\FlexLexer.h
..........\gen.c
..........\initscan.c
..........\INSTALL
..........\install.sh
..........\libmain.c
..........\libyywrap.c
..........\main.c
..........\main.dsp
..........\main.dsw
..........\main.ncb
..........\main.opt
..........\main.plg
..........\Makefile.in
..........\MISC
..........\....\alloca.c
..........\....\Amiga
..........\....\.....\config.h
..........\....\.....\libmain.ch
..........\....\.....\libyywrap.ch
..........\....\.....\parse.ych
..........\....\.....\README.amiga
..........\....\.....\SMakefile
..........\....\Atari
..........\....\.....\Atari.patches
..........\....\Borland
..........\....\.......\config.h
..........\....\.......\Makefile
..........\....\.......\NOTES
..........\....\Borland.old
..........\....\...........\Borland-2.4
..........\....\...........\Turbo-C
..........\....\debflex.awk
..........\....\EBCDIC
..........\....\fastwc
..........\....\......\mywc.c
..........\....\......\README
..........\....\......\wc1.l
..........\....\......\wc2.l
..........\....\......\wc3.l
..........\....\......\wc4.l
..........\....\......\wc5.l
..........\....\flex.man
..........\....\Macintosh
..........\....\.........\alloca.c
..........\....\.........\alloca.h
..........\....\.........\THINK_C_notes
..........\....\.........\xmalloc.c
..........\....\MSDOS
..........\....\.....\configur.bat
..........\....\.....\djgpp.sed
..........\....\.....\MSC70.make
..........\....\MVS
..........\....\...\diffs
..........\....\...\fixit.l
..........\....\...\initscan-mvs.c
..........\....\...\MVS.mail
..........\....\...\MVS.todo
..........\....\...\MVS.uudecode
..........\....\...\README
..........\....\...\unfixit.l
..........\....\NeXT
..........\....\NT
..........\....\..\config.h
..........\....\..\Makefile
..........\....\OS2
..........\....\...\config.h
..........\....\...\Makefile.os2
..........\....\parse.c
..........\....\parse.h
..........\....\README
..........\....\testxxLexer.l
..........\....\texinfo
..........\....\.......\flex.info
..........\....\.......\flex.texi
..........\....\VMS
..........\....\...\descrip.mms
..........\....\...\mkskel.tpu
..........\....\...\README.VMS
..........\....\...\vms-code.c
..........\....\...\vms-conf.h
..........\misc.c