[GRASS5] [bug #3909] (grass) configure: error: *** Unable to locate lex

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this bug's URL: http://intevation.de/rt/webrt?serial_num=3909
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Subject: configure: error: *** Unable to locate lex

Platform: GNU/Linux/i386
grass obtained from: Trento Italy site
grass binary for platform: Downloaded precompiled Binaries

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Hola : recien empiezo con GNU/linux y queria probar Grass, pero veo unos errores y no entiendo que puede pasar, me podrian ayudar a instalarlo.
Gracias, desde Argentina, Claudio.
cfpacher at argentina.com

root at ubuntu:/home/agustina/grass-6.0.1 # ./configure
checking host system type... i686-pc-linux-gnu
checking for gcc... gcc
checking whether the C compiler (gcc  ) works... yes
checking whether the C compiler (gcc  ) is a cross-compiler... no
checking whether we are using GNU C... yes
checking whether gcc accepts -g... yes
checking for full floating-point support... yes
checking for pwd... /bin/pwd
checking for source directory... /home/agustina/grass-6.0.1
checking for build directory... /home/agustina/grass-6.0.1
checking how to build libraries... shared
yes
checking for ranlib... ranlib
checking how to run the C preprocessor... gcc -E
checking if 64bit support is requested... no
checking if 64bit Sparc VIS support is requested... no
checking system version (for dynamic loading)... Linux-2.6.10-5-386
checking for dlopen in -ldl... yes
checking for ar... ar
checking for SysV... no
checking for XDriver... socket
checking for additional include dirs...
checking for additional library dirs...
checking for a BSD compatible install... /usr/bin/install -c
checking for flex... lex
checking for yywrap in -ll... no
checking for lex... no
configure: error: *** Unable to locate lex.

root at ubuntu:/home/agustina/grass-6.0.1 # make
Makefile:22: include/Make/Platform.make: No existe el fichero o el directorio
Makefile:23: include/Make/Grass.make: No existe el fichero o el directorio
make: *** No hay ninguna regla para construir el objetivo `include/Make/Grass.make'.  Alto.


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