MLton runs fine on the PowerPC64 architecture.
Notes
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When compiling for PowerPC64, MLton targets the 64-bit PowerPC architecture. 
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When compiling for PowerPC64, MLton doesn’t support native code generation ( -codegen native). Hence, performance is not as good as it might be and compile times are longer. Also, the quality of code generated bygccis important. By default, MLton callsgcc -O1. You can change this by calling MLton with-cc-opt -O2.
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On the PowerPC64, the GMP library supports multiple ABIs. See the GMP page for more details.