I am using Python 3.10.12 and Scons 4.7.0, and all the required dependencies have been properly configured. On my platform, I can successfully build gem5 (stable). Could you please share the environment you used to build gem5-avx? look forward to your reply.

ps: The error message is as follows

build/X86/sim/init_signals.cc:67:32: error: size of array 'fatalSigStack' is not an integral constant-expression
67 | static uint8_t fatalSigStack[2 * SIGSTKSZ];
| ^
scons: *** [build/X86/sim/init_signals.o] Error 1