Vivado Simulator 2020.2
Copyright 1986-1999, 2001-2020 Xilinx, Inc. All Rights Reserved.
Running: /home/leo/Xilinx/Vivado/2020.2/bin/unwrapped/lnx64.o/xelab -wto a89cd1a64aa944bbb71fe9d87fc2a721 --incr --debug typical --relax --mt 8 -L xil_defaultlib -L ourTypes -L unisims_ver -L unimacro_ver -L secureip -L xpm --snapshot VGA_top_behav xil_defaultlib.VGA_top xil_defaultlib.glbl -log elaborate.log 
Using 8 slave threads.
Starting static elaboration
Pass Through NonSizing Optimizer
WARNING: [VRFC 10-3813] value in initialization depends on signal 'dummypos' [/home/leo/projet_vga_etn_sources/VGA_top.vhd:155]
Completed static elaboration
Starting simulation data flow analysis
Completed simulation data flow analysis
Time Resolution for simulation is 1ps
ERROR: [XSIM 43-3388] /usr/bin/gcc not found, please install GCC for your Linux distribution.
ERROR: [XSIM 43-3915] Encountered a fatal error. Cannot continue. Exiting...