I had to install some packages (fp-units-fcl, fp-units-gfx...). But now I get an other error that I don't understand at all :
Compiling lclstrconsts.pas
Writing Resource String Table file: units/i386/linux/lclstrconsts.rst
lclstrconsts.pas(189) Error: Writing Resource String Table file: $1
lclstrconsts.pas(189) Fatal: There were 1 errors compiling module, stopping
make[1]: *** [alllclunits.ppu] Erreur 1
make[1]: quittant le répertoire « /opt/lazarus/lcl »
make: *** [lcl] Erreur 2