Bonjour
Je suis sous Ubuntu. Lors de la compilation d'un projet qui utilise flex et bison
j'obtiens les erreurs suivantes

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/bin/bash ./libtool --tag=CC   --mode=compile gcc -DHAVE_CONFIG_H -I.   -I.  -g -O2 -ggdb3 -Wall -W  -Wmissing-prototypes -Wmissing-declarations -Wstrict-prototypes  -Waggregate-return  -Wpointer-arith -Wbad-function-cast -Wnested-externs -MT argp-eexst.lo -MD -MP -MF .deps/argp-eexst.Tpo -c -o argp-eexst.lo argp-eexst.c
./libtool: line 386: /usr/local/bin/gsed: Aucun fichier ou répertoire de ce type
./libtool: line 780: /usr/local/bin/gsed: No such file or directory
: ignoring unknown tag 
./libtool: line 780: /usr/local/bin/gsed: No such file or directory
*** Warning: inferring the mode of operation is deprecated.
*** Future versions of Libtool will require --mode=MODE be specified.
./libtool: line 1090: /usr/local/bin/gsed: No such file or directory
./libtool: line 1090: /usr/local/bin/gsed: No such file or directory
./libtool: line 1090: /usr/local/bin/gsed: No such file or directory
./libtool: line 1090: /usr/local/bin/gsed: No such file or directory
./libtool: line 1090: /usr/local/bin/gsed: No such file or directory
./libtool: line 1090: /usr/local/bin/gsed: No such file or directory
./libtool: line 1090: /usr/local/bin/gsed: No such file or directory
./libtool: line 1090: /usr/local/bin/gsed: No such file or directory
./libtool: line 1090: /usr/local/bin/gsed: No such file or directory
./libtool: line 1090: /usr/local/bin/gsed: No such file or directory
./libtool: line 1090: /usr/local/bin/gsed: No such file or directory
./libtool: line 1090: /usr/local/bin/gsed: No such file or directory
./libtool: line 1090: /usr/local/bin/gsed: No such file or directory
./libtool: line 1090: /usr/local/bin/gsed: No such file or directory
./libtool: line 1090: /usr/local/bin/gsed: No such file or directory
./libtool: line 1090: /usr/local/bin/gsed: No such file or directory
./libtool: line 1090: /usr/local/bin/gsed: No such file or directory
./libtool: line 1090: /usr/local/bin/gsed: No such file or directory
./libtool: line 1090: /usr/local/bin/gsed: No such file or directory
./libtool: line 1090: /usr/local/bin/gsed: No such file or directory
./libtool: line 1090: /usr/local/bin/gsed: No such file or directory
./libtool: line 1090: /usr/local/bin/gsed: No such file or directory
./libtool: line 1090: /usr/local/bin/gsed: No such file or directory
./libtool: line 1141: /usr/local/bin/gsed: No such file or directory
: compile: cannot determine name of library object from `'


J'ai regarder et gnu sed est installer a part si je me trompe et que c'est pas sa si quelqu'un pouvait m'aider s'il vous plait à régler mon problème

Merci; bonne soirée