Can not compile custom object

[Mestro402]

Hello, after I wrote DarcyPressure object in step5 of tutorial 1, I met the problem that it could not be compiled. It shows that I can't find cstdlib, whereas I myself compiled the header file containing cstdlib separately using g++. I also had this problem with the offline version of MOOSE. It seems that I didn't install MOOSE correctly. Can anyone help me please? Thanks a lot.

The following is the information returned by the terminal

(moose) mestro@mestro-PC:~/projects/moose$ cd ..
(moose) mestro@mestro-PC:~/projects$ cd my_first/
(moose) mestro@mestro-PC:~/projects/my_first$ ls
a.out  build  doc  hs.c  include  lib  LICENSE  Makefile  my_first-opt  problems  README.md  run_tests  scripts  src  test  testroot  unit
(moose) mestro@mestro-PC:~/projects/my_first$ cd include/kernels/
(moose) mestro@mestro-PC:~/projects/my_first/include/kernels$ ls
DarcyPressure.h
(moose) mestro@mestro-PC:~/projects/my_first/include/kernels$ cd ../../src/kernels/
(moose) mestro@mestro-PC:~/projects/my_first/src/kernels$ ls
DarcyPressure.c
(moose) mestro@mestro-PC:~/projects/my_first/src/kernels$ cd ../../
(moose) mestro@mestro-PC:~/projects/my_first$ make -j 4
Using HIT from /home/mestro/projects/moose/framework/contrib/hit
Checking if header needs updating: /home/mestro/projects/moose/framework/include/base/MooseRevision.h...
Compiling C++ (in opt mode) /home/mestro/projects/moose/framework/build/unity_src/multiapps_Unity.C...
Compiling C++ (in opt mode) /home/mestro/projects/moose/framework/build/unity_src/interfacekernels_Unity.C...
......

Compiling C (in opt mode) /home/mestro/projects/my_first/src/kernels/DarcyPressure.c...
In file included from /home/mestro/anaconda3/envs/moose/libmesh/include/libmesh/threads.h:24,
                 from /home/mestro/projects/moose/framework/build/header_symlinks/HashMap.h:13,
                 from /home/mestro/projects/moose/framework/build/header_symlinks/MooseUtils.h:13,
                 from /home/mestro/projects/moose/framework/build/header_symlinks/InputParameters.h:13,
                 from /home/mestro/projects/moose/framework/build/header_symlinks/MooseObject.h:13,
                 from /home/mestro/projects/moose/framework/build/header_symlinks/ResidualObject.h:12,
                 from /home/mestro/projects/moose/framework/build/header_symlinks/KernelBase.h:12,
                 from /home/mestro/projects/moose/framework/build/header_symlinks/ADKernel.h:12,
                 from /home/mestro/projects/moose/framework/build/header_symlinks/ADKernelGrad.h:12,
                 from /home/mestro/projects/my_first/build/header_symlinks/DarcyPressure.h:2,
                 from /home/mestro/projects/my_first/src/kernels/DarcyPressure.c:1:
/home/mestro/anaconda3/envs/moose/libmesh/include/libmesh/libmesh_common.h:36:10: fatal error: cstdlib: No such file or directory
   36 | #include <cstdlib>
      |          ^~~~~~~~~
compilation terminated.
make: *** [/home/mestro/projects/moose/framework/build.mk:152：/home/mestro/projects/my_first/src/kernels/DarcyPressure.x86_64-conda-linux-gnu.opt.lo] 错误 1

[GiudGiud]

Hello

The compiler thinks DarcyPressure is a C source file, because of the .c extension. Please rename it to .C (capital C) and let us know if that solves the issue.

Best,
Guillaume