I tried to compile a co-simulation FMU (2.0) and the compiler complains that inttypes.h is missing. The same error ocurred when I try to run any model. Here is the compiler settings: 
And here is the compiler error:
There is a macro in modelica_types.h: HAVE_INTTYPES_H and seems to me that it is defined somewhere else, so the compiler tries to compile with this header but doesn't find it. I inspected the folder of modelica_types.h but didn't see any inttypes.h.
System:
Product version: 12.3.1.7
Client: Model Center
Client version: 12.3.1.6
Client creation date: 2021-06-07T11:45:13.640000
Client build revisions: S:1b0160c02, J:1dbf5d051, L:38c242434
Client build type: 64 bit
Kernel version: 12.3.1.7
Kernel creation date: 2021-05-27T14:59:37.824000
Kernel build revisions: S:745840ba9, J:84e3d9a4b, L:38c242434
Kernel root directory: C:\Program Files\Wolfram Research\SystemModeler 12.3.1
Installation directory: C:\Program Files\Wolfram Research\SystemModeler 12.3.1
Platform: Windows 10 Version 1909
