Simulink compilation failure UAV Toolbox Support Package for PX4

I'm using Ubuntu 20.04 and I'm trying to develop the controller in the 'px4demo_PositionController_quadrotor' (https://it.mathworks.com/help/supportpkg/px4/ref/position-tracking-example.html) in my own flight controller (Pixracer R15), all the setup and configuration step are ok but when I try to execute Monitor and Tune or Build, Deploy and Start I get the following compilation error:

Compilation failure for command "/opt/gcc-arm-none-eabi-9-2020-q2-update/bin/arm-none-eabi-g++ -DCONFIG_ARCH_BOARD_PX4_FMU_V4 -DCONSTRAINED_MEMORY -D_SYS_CDEFS_H_ -D_SYS_REENT_H_ -D__CUSTOM_FILE_IO__ -D__PX4_NUTTX -D__STDC_FORMAT_MACROS -DMODULE_NAME=\"px4_simulink_app\" -DPX4_MAIN=px4_simulink_app_app_main -DMODEL=px4demo_PositionController_quadrotor -DNUMST=1 -DNCSTATES=0 -DHAVESTDIO -DMODEL_HAS_DYNAMICALLY_LOADED_SFCNS=0 -DCLASSIC_INTERFACE=0 -DALLOCATIONFCN=0 -DTID01EQ=0 -DTERMFCN=1 -DONESTEPFCN=1 -DMAT_FILE=0 -DMULTI_INSTANCE_CODE=0 -DINTEGER_CODE=0 -DMT=0 -DPX4 -DFMUv4 -DNULL=0 -DMW_PX4_NUTTX_BUILD -DEXTMODE_DISABLETESTING -DEXTMODE_DISABLEPRINTF -DEXTMODE_DISABLE_ARGS_PROCESSING=1 -D__linux__ -DXCP_PLATFORM_LINUX_NO_PIE_SUPPORT -DSTACK_SIZE=64 -D__MW_TARGET_USE_HARDWARE_RESOURCES_H__ -DRT -DMW_PX4_DISABLE_MAVLINK=1 -mcpu=cortex-m4 -mthumb -mfpu=fpv4-sp-d16 -mfloat-abi=hard -Os -DNDEBUG -g -fdata-sections -ffunction-sections -fomit-frame-pointer -fmerge-all-constants -fno-signed-zeros -fno-trapping-math -freciprocal-math -fno-math-errno -fno-strict-aliasing -fvisibility=hidden -include visibility.h -Wall -Wextra -Warray-bounds -Wcast-align -Wdisabled-optimization -Wdouble-promotion -Wfatal-errors -Wfloat-equal -Wformat-security -Winit-self -Wlogical-op -Wpointer-arith -Wshadow -Wuninitialized -Wunknown-pragmas -Wunused-variable -Wno-missing-field-initializers -Wno-missing-include-dirs -Wno-unused-parameter -fdiagnostics-color=always -Wno-stringop-truncation -fno-builtin-printf -fno-strength-reduce -Wformat=1 -Wunused-but-set-variable -Wno-format-truncation -fcheck-new -fno-exceptions -fno-rtti -fno-threadsafe-statics -Wreorder -Wno-overloaded-virtual -nostdinc++ -fno-sized-deallocation -Wframe-larger-than=2000 -fpermissive -Wno-narrowing -std=gnu++14 -I../../boards/px4/fmu-v4/src -I../../platforms/nuttx/src/px4/common/include -I. -Isrc/lib -I../../platforms/nuttx/src/px4/stm/stm32f4/include -I../../platforms/common -I../../platforms/common/include -I../../src -I../../src/include -I../../src/lib -I../../src/lib/matrix -I../../src/modules -INuttX/nuttx/arch/arm/src/armv7-m -INuttX/nuttx/arch/arm/src/chip -INuttX/nuttx/arch/arm/src/common -INuttX/apps/include -Iexternal/Install/include -I../../src/modules/px4_simulink_app -I../../src/modules/mavlink -I../../mavlink/include/mavlink -I/home/paolo/tesi -I/home/paolo/SupportPackages/R2022b/toolbox/target/supportpackages/px4/include -I/home/paolo/tesi/px4demo_PositionController_quadrotor_ert_rtw -I/usr/local/MATLAB/R2022b/extern/include -I/usr/local/MATLAB/R2022b/simulink/include -I/usr/local/MATLAB/R2022b/rtw/c/src -I/usr/local/MATLAB/R2022b/rtw/c/src/ext_mode/common -I/usr/local/MATLAB/R2022b/rtw/c/ert -I/usr/local/MATLAB/R2022b/rtw/c/src/ext_mode/serial -o src/modules/px4_simulink_app/CMakeFiles/modules__px4_simulink_app.dir/MW_uORB_Read.cpp.obj -c ../../src/modules/px4_simulink_app/MW_uORB_Read.cpp" with error "In file included from [01m [K<command-line> [m [K:

[01m [K../../src/include/visibility.h:119:10: [m [K [01;31m [Kfatal error: [m [Kcstdlib: No such file or directory

119 | #include [01;31m [K<cstdlib> [m [K

| [01;31m [K^~~~~~~~~ [m [K

compilation terminated.

[pc-robotica]

Did you find any solution? I have the same problem

[Paolo]

Hi @lorenzo silvestri, I'm really sorry but I can't help you. I was unable to solve this issue so at the end I used the toolobox on Windows 11 instead of Ubuntu.