Problem with compiling SimulinkCompiler example

Hi everyone I am trying to compile the Simulinkcompiler example:

https://de.mathworks.com/help/releases/R2020a/slcompiler/ug/deploy-app-designer-app-with-simulinkcompiler.html

If I am trying to run the .mlapp I get the following error:

### Building the rapid accelerator target for model: MassSpringDamperModel
### Build procedure for MassSpringDamperModel aborted due to an error.
Error using MassSpringDamperApp/SimulateButtonPushed (line 115)
Unable to build a standalone executable to simulate the model 'MassSpringDamperModel' in rapid accelerator mode.

Caused by:
    Error using Simulink.BlockDiagram.buildRapidAcceleratorTarget (line 37)
    Aktive Codepage: 1252.
    "C:\TDM-GC~1\bin/gcc" -c -fwrapv -m64 -O0 -DCLASSIC_INTERFACE=1 -DALLOCATIONFCN=0 -DONESTEPFCN=0 -DTERMFCN=1
    -DMULTI_INSTANCE_CODE=0 -DINTEGER_CODE=0 -DEXT_MODE -DIS_RAPID_ACCEL -DTGTCONN -DNRT -DRSIM_PARAMETER_LOADING
    -DRSIM_WITH_SL_SOLVER -DENABLE_SLEXEC_SSBRIDGE=1 -DMODEL_HAS_DYNAMICALLY_LOADED_SFCNS=0 -DON_TARGET_WAIT_FOR_START=0 -DTID01EQ=0
    -DMODEL=MassSpringDamperModel -DNUMST=1 -DNCSTATES=2 -DHAVESTDIO  @MassSpringDamperModel_comp.rsp -o "rt_logging.obj"
    "C:/PROGRA~1/MATLAB/R2020a/rtw/c/src/rt_logging.c"
    "C:\TDM-GC~1\bin/gcc" -c -fwrapv -m64 -O0 -DCLASSIC_INTERFACE=1 -DALLOCATIONFCN=0 -DONESTEPFCN=0 -DTERMFCN=1
    -DMULTI_INSTANCE_CODE=0 -DINTEGER_CODE=0 -DEXT_MODE -DIS_RAPID_ACCEL -DTGTCONN -DNRT -DRSIM_PARAMETER_LOADING
    -DRSIM_WITH_SL_SOLVER -DENABLE_SLEXEC_SSBRIDGE=1 -DMODEL_HAS_DYNAMICALLY_LOADED_SFCNS=0 -DON_TARGET_WAIT_FOR_START=0 -DTID01EQ=0
    -DMODEL=MassSpringDamperModel -DNUMST=1 -DNCSTATES=2 -DHAVESTDIO  @MassSpringDamperModel_comp.rsp -o "MassSpringDamperModel.obj"
    "C:/Users/bean657/Documents/MATLAB/Examples/R2020a/simulinkcompiler/DeployingASimulationAppUsingSimulinkCompilerExample/slprj/raccel/MassSpringDamperModel/MassSpringDamperModel.c"
        "C:\TDM-GC~1\bin/gcc" -c -fwrapv -m64 -O0 -DCLASSIC_INTERFACE=1 -DALLOCATIONFCN=0 -DONESTEPFCN=0 -DTERMFCN=1
    -DMULTI_INSTANCE_CODE=0 -DINTEGER_CODE=0 -DEXT_MODE -DIS_RAPID_ACCEL -DTGTCONN -DNRT -DRSIM_PARAMETER_LOADING
    -DRSIM_WITH_SL_SOLVER -DENABLE_SLEXEC_SSBRIDGE=1 -DMODEL_HAS_DYNAMICALLY_LOADED_SFCNS=0 -DON_TARGET_WAIT_FOR_START=0 -DTID01EQ=0
    -DMODEL=MassSpringDamperModel -DNUMST=1 -DNCSTATES=2 -DHAVESTDIO  @MassSpringDamperModel_comp.rsp -o
    "MassSpringDamperModel_capi.obj"
    "C:/Users/bean657/Documents/MATLAB/Examples/R2020a/simulinkcompiler/DeployingASimulationAppUsingSimulinkCompilerExample/slprj/raccel/MassSpringDamperModel/MassSpringDamperModel_capi.c"
        "C:\TDM-GC~1\bin/gcc" -c -fwrapv -m64 -O0 -DCLASSIC_INTERFACE=1 -DALLOCATIONFCN=0 -DONESTEPFCN=0 -DTERMFCN=1
    -DMULTI_INSTANCE_CODE=0 -DINTEGER_CODE=0 -DEXT_MODE -DIS_RAPID_ACCEL -DTGTCONN -DNRT -DRSIM_PARAMETER_LOADING
    -DRSIM_WITH_SL_SOLVER -DENABLE_SLEXEC_SSBRIDGE=1 -DMODEL_HAS_DYNAMICALLY_LOADED_SFCNS=0 -DON_TARGET_WAIT_FOR_START=0 -DTID01EQ=0
    -DMODEL=MassSpringDamperModel -DNUMST=1 -DNCSTATES=2 -DHAVESTDIO  @MassSpringDamperModel_comp.rsp -o
    "MassSpringDamperModel_data.obj"
    "C:/Users/bean657/Documents/MATLAB/Examples/R2020a/simulinkcompiler/DeployingASimulationAppUsingSimulinkCompilerExample/slprj/raccel/MassSpringDamperModel/MassSpringDamperModel_data.c"
        "C:\TDM-GC~1\bin/gcc" -c -fwrapv -m64 -O0 -DCLASSIC_INTERFACE=1 -DALLOCATIONFCN=0 -DONESTEPFCN=0 -DTERMFCN=1
    -DMULTI_INSTANCE_CODE=0 -DINTEGER_CODE=0 -DEXT_MODE -DIS_RAPID_ACCEL -DTGTCONN -DNRT -DRSIM_PARAMETER_LOADING
    -DRSIM_WITH_SL_SOLVER -DENABLE_SLEXEC_SSBRIDGE=1 -DMODEL_HAS_DYNAMICALLY_LOADED_SFCNS=0 -DON_TARGET_WAIT_FOR_START=0 -DTID01EQ=0
    -DMODEL=MassSpringDamperModel -DNUMST=1 -DNCSTATES=2 -DHAVESTDIO  @MassSpringDamperModel_comp.rsp -o
    "MassSpringDamperModel_tgtconn.obj"
    "C:/Users/bean657/Documents/MATLAB/Examples/R2020a/simulinkcompiler/DeployingASimulationAppUsingSimulinkCompilerExample/slprj/raccel/MassSpringDamperModel/MassSpringDamperModel_tgtconn.c"
        "C:\TDM-GC~1\bin/gcc" -c -fwrapv -m64 -O0 -DCLASSIC_INTERFACE=1 -DALLOCATIONFCN=0 -DONESTEPFCN=0 -DTERMFCN=1
    -DMULTI_INSTANCE_CODE=0 -DINTEGER_CODE=0 -DEXT_MODE -DIS_RAPID_ACCEL -DTGTCONN -DNRT -DRSIM_PARAMETER_LOADING
    -DRSIM_WITH_SL_SOLVER -DENABLE_SLEXEC_SSBRIDGE=1 -DMODEL_HAS_DYNAMICALLY_LOADED_SFCNS=0 -DON_TARGET_WAIT_FOR_START=0 -DTID01EQ=0
    -DMODEL=MassSpringDamperModel -DNUMST=1 -DNCSTATES=2 -DHAVESTDIO  @MassSpringDamperModel_comp.rsp -o "rtGetInf.obj"
    "C:/Users/bean657/Documents/MATLAB/Examples/R2020a/simulinkcompiler/DeployingASimulationAppUsingSimulinkCompilerExample/slprj/raccel/MassSpringDamperModel/rtGetInf.c"
        "C:\TDM-GC~1\bin/gcc" -c -fwrapv -m64 -O0 -DCLASSIC_INTERFACE=1 -DALLOCATIONFCN=0 -DONESTEPFCN=0 -DTERMFCN=1
    -DMULTI_INSTANCE_CODE=0 -DINTEGER_CODE=0 -DEXT_MODE -DIS_RAPID_ACCEL -DTGTCONN -DNRT -DRSIM_PARAMETER_LOADING
    -DRSIM_WITH_SL_SOLVER -DENABLE_SLEXEC_SSBRIDGE=1 -DMODEL_HAS_DYNAMICALLY_LOADED_SFCNS=0 -DON_TARGET_WAIT_FOR_START=0 -DTID01EQ=0
    -DMODEL=MassSpringDamperModel -DNUMST=1 -DNCSTATES=2 -DHAVESTDIO  @MassSpringDamperModel_comp.rsp -o "rtGetNaN.obj"
    "C:/Users/bean657/Documents/MATLAB/Examples/R2020a/simulinkcompiler/DeployingASimulationAppUsingSimulinkCompilerExample/slprj/raccel/MassSpringDamperModel/rtGetNaN.c"
        "C:\TDM-GC~1\bin/gcc" -c -fwrapv -m64 -O0 -DCLASSIC_INTERFACE=1 -DALLOCATIONFCN=0 -DONESTEPFCN=0 -DTERMFCN=1
    -DMULTI_INSTANCE_CODE=0 -DINTEGER_CODE=0 -DEXT_MODE -DIS_RAPID_ACCEL -DTGTCONN -DNRT -DRSIM_PARAMETER_LOADING
    -DRSIM_WITH_SL_SOLVER -DENABLE_SLEXEC_SSBRIDGE=1 -DMODEL_HAS_DYNAMICALLY_LOADED_SFCNS=0 -DON_TARGET_WAIT_FOR_START=0 -DTID01EQ=0
    -DMODEL=MassSpringDamperModel -DNUMST=1 -DNCSTATES=2 -DHAVESTDIO  @MassSpringDamperModel_comp.rsp -o "rt_nonfinite.obj"
    "C:/Users/bean657/Documents/MATLAB/Examples/R2020a/simulinkcompiler/DeployingASimulationAppUsingSimulinkCompilerExample/slprj/raccel/MassSpringDamperModel/rt_nonfinite.c"
        "C:\TDM-GC~1\bin/gcc" -c -fwrapv -m64 -O0 -DCLASSIC_INTERFACE=1 -DALLOCATIONFCN=0 -DONESTEPFCN=0 -DTERMFCN=1
    -DMULTI_INSTANCE_CODE=0 -DINTEGER_CODE=0 -DEXT_MODE -DIS_RAPID_ACCEL -DTGTCONN -DNRT -DRSIM_PARAMETER_LOADING
    -DRSIM_WITH_SL_SOLVER -DENABLE_SLEXEC_SSBRIDGE=1 -DMODEL_HAS_DYNAMICALLY_LOADED_SFCNS=0 -DON_TARGET_WAIT_FOR_START=0 -DTID01EQ=0
    -DMODEL=MassSpringDamperModel -DNUMST=1 -DNCSTATES=2 -DHAVESTDIO  @MassSpringDamperModel_comp.rsp -o "rt_logging_mmi.obj"
    "C:/PROGRA~1/MATLAB/R2020a/rtw/c/src/rt_logging_mmi.c"
    "C:\TDM-GC~1\bin/gcc" -c -fwrapv -m64 -O0 -DCLASSIC_INTERFACE=1 -DALLOCATIONFCN=0 -DONESTEPFCN=0 -DTERMFCN=1
    -DMULTI_INSTANCE_CODE=0 -DINTEGER_CODE=0 -DEXT_MODE -DIS_RAPID_ACCEL -DTGTCONN -DNRT -DRSIM_PARAMETER_LOADING
    -DRSIM_WITH_SL_SOLVER -DENABLE_SLEXEC_SSBRIDGE=1 -DMODEL_HAS_DYNAMICALLY_LOADED_SFCNS=0 -DON_TARGET_WAIT_FOR_START=0 -DTID01EQ=0
    -DMODEL=MassSpringDamperModel -DNUMST=1 -DNCSTATES=2 -DHAVESTDIO  @MassSpringDamperModel_comp.rsp -o "rtw_modelmap_utils.obj"
    "C:/PROGRA~1/MATLAB/R2020a/rtw/c/src/rtw_modelmap_utils.c"
    "C:\TDM-GC~1\bin/gcc" -c -fwrapv -m64 -O0 -DCLASSIC_INTERFACE=1 -DALLOCATIONFCN=0 -DONESTEPFCN=0 -DTERMFCN=1
    -DMULTI_INSTANCE_CODE=0 -DINTEGER_CODE=0 -DEXT_MODE -DIS_RAPID_ACCEL -DTGTCONN -DNRT -DRSIM_PARAMETER_LOADING
    -DRSIM_WITH_SL_SOLVER -DENABLE_SLEXEC_SSBRIDGE=1 -DMODEL_HAS_DYNAMICALLY_LOADED_SFCNS=0 -DON_TARGET_WAIT_FOR_START=0 -DTID01EQ=0
    -DMODEL=MassSpringDamperModel -DNUMST=1 -DNCSTATES=2 -DHAVESTDIO  @MassSpringDamperModel_comp.rsp -o "raccel_main_new.obj"
    "C:/PROGRA~1/MATLAB/R2020a/rtw/c/raccel/raccel_main_new.c"
    "C:\TDM-GC~1\bin/gcc" -c -fwrapv -m64 -O0 -DCLASSIC_INTERFACE=1 -DALLOCATIONFCN=0 -DONESTEPFCN=0 -DTERMFCN=1
    -DMULTI_INSTANCE_CODE=0 -DINTEGER_CODE=0 -DEXT_MODE -DIS_RAPID_ACCEL -DTGTCONN -DNRT -DRSIM_PARAMETER_LOADING
    -DRSIM_WITH_SL_SOLVER -DENABLE_SLEXEC_SSBRIDGE=1 -DMODEL_HAS_DYNAMICALLY_LOADED_SFCNS=0 -DON_TARGET_WAIT_FOR_START=0 -DTID01EQ=0
    -DMODEL=MassSpringDamperModel -DNUMST=1 -DNCSTATES=2 -DHAVESTDIO  @MassSpringDamperModel_comp.rsp -o "raccel_sup.obj"
    "C:/PROGRA~1/MATLAB/R2020a/rtw/c/raccel/raccel_sup.c"
    C:/PROGRA~1/MATLAB/R2020a/rtw/c/raccel/raccel_sup.c: In function 'getRootInputSize':
    C:/PROGRA~1/MATLAB/R2020a/rtw/c/raccel/raccel_sup.c:1184:5: error: 'for' loop initial declarations are only allowed in C99 or C11
    mode
         for (int loopIdx = 0; loopIdx < numDims; ++loopIdx) {
         ^
    C:/PROGRA~1/MATLAB/R2020a/rtw/c/raccel/raccel_sup.c:1184:5: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to
    compile your code
    gmake: *** [raccel_sup.obj] Error 1
    The make command returned an error of 2

    Error(s) encountered while building "MassSpringDamperModel":
    ### Failed to generate all binary outputs.
 
Error using matlab.ui.control.internal.controller.ComponentController/executeUserCallback (line 382)
Error while evaluating Button PrivateButtonPushedFcn.

As the stack trace shows there is a probleme with the initial declaration in the for-loop:

    C:/PROGRA~1/MATLAB/R2020a/rtw/c/raccel/raccel_sup.c:1184:5: error: 'for' loop initial declarations are only allowed in C99 or C11
    mode
         for (int loopIdx = 0; loopIdx < numDims; ++loopIdx) {
         ^
    C:/PROGRA~1/MATLAB/R2020a/rtw/c/raccel/raccel_sup.c:1184:5: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to
    compile your code
    gmake: *** [raccel_sup.obj] Error 1
    The make command returned an error of 2

Does anyone know how and where I have to set the compiler options with -std=c99... ?

I am using Matlab R2020a and I have Simulink and SimulinkCompiler installed.

Thanks!