i'm trying to build trunk with my newly minted fpc 3.0.0 but i'm running into the following...

[ 53%] Compiled package utils-fprcp
Start compiling package utils-h2pas for target x86_64-linux. Executing command "/home/wkitty42/development/fpc/trunk/bin/plex h2pas/scan.l h2pas/scan.pas"
The installer encountered the following error:
External command "/home/wkitty42/development/fpc/trunk/bin/plex h2pas/scan.l h2pas/scan.pas" failed with exit code 256. Console output: TP Lex Version 4.1a [April 2000], Copyright (c) 1990-2000 Albert Graef

FATAL: cannot open file /usr/lib/fpc/lexyacc/yylex.cod

make[2]: *** [all] Error 1
make[2]: Leaving directory `/home/wkitty42/development/fpc/trunk/utils' make[1]: *** [utils_all] Error 2
make[1]: Leaving directory `/home/wkitty42/development/fpc/trunk' make: *** [build-stamp.x86_64-linux] Error 2
make: Leaving directory `/home/wkitty42/development/fpc/trunk'

i understand why it cannot find and open that file... it doesn't exist as there is no system-wide installation of fpc... there's only my user installed ones in my home directory...

to get here, i've just built release_2.6.4 (using the release_2.6.2 compiler) and release_3.0.0 (using my newly built release_2.6.4 compiler)... i have also compiled fixes_3_0 (with my newly built release_3.0.0 compiler)... once i worked out the proper order, this all worked fine with no problems... each of these is in their own directory...

eg:
~/development/fpc/2.6.4
~/development/fpc/3.0.0
~/development/fpc/fixes_3_0
~/development/fpc/trunk

now i'm trying to build trunk (3.1.1) and i'm having the above problem that i've never seen before... how can i fix it? do i need to install a ubuntu package for lex or something? or perhaps just creating a link for the file and point the link to the existing ~/development/fpc/trunk/utils/tply/yylex.cod?? probably also need one for yyparse.cod??

kubuntu 14.04.4 LTS