Why doesn't the Simulation Library Compiler see my Mentor Graphics Questasim installation as valid? - Why doesn't the Simulation Library Compiler see my Mentor Graphics Questasim installation as valid? Description Due to a problem in the Quartus® II software version 11.1, the Simulation Library Compiler GUI may not see Mentor Graphics® Questasim® installations as valid when specified in the Executable Location field. Resolution To work around this problem in the Quartus® II software version 11.1, the command line version of the Simulation Library Compiler can be used as follows: quartus_sh(.exe) --simlib_comp -family all -tool questasim -language <vhdl/Verilog> -tool_path <path> For example: quartus_sh.exe --simlib_comp -family all -tool questasim -language vhdl -tool_path C:\questasim64_10.0c\win64 This problem is fixed beginning with the Quartus II software version 12.0. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] 12.0 11.1 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']