I built sympy and all unkeyworded dependencies with FEATURES=test Currently there is one failing test, reported upstream as https://github.com/sympy/sympy/issues/24071 The failure exposes a real bug, which on IEEE floats only appears with subnormal numbers but is easier to trigger with PPC64 double-double format. However, even if it is not fixed, the upcoming transition to IEEE long double ABI should fix it. Reproducible: Always