The OMNeT++ IDE (and the OMNeT++ simulation framework itself) requires a
preinstalled compiler toolchain to function properly.
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On Windows: The OMNeT++ distribution comes with a preconfigured MinGW compiler toolchain,
there is no need to manually install anything. By default, the IDE uses the Clang compiler
from MinGW, but it is also possible to switch to the GCC compiler (also part of MinGW).
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On Linux: By default, the Clang compiler is used, but OMNeT++ falls back to use GCC
if Clang is not present on the system. You have to install Clang or GCC
on your system before trying to compile a simulation with OMNeT++. Please read the
Install Guide for detailed instructions.
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On macOS: You need to install Xcode Developer Tools to get compiler
support before trying to compile a simulation with OMNeT++.
Please read the Install Guide for detailed instructions.