I was working up to now with CAMB-0.1.7 wiht Parameterised-Post-Friedmann (PPF) with (w0,wa) parameters : for this I had to compile CAMB-0.1.7 with the following command :
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$ make EQUATIONS=equations_ppf
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make
Indeed, if I add this line in CAMB-1.3.5 params.ini :
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#Dark energy can be "fluid" (constant w), or "PPF" (allowing wa, and w=-1 crossing)
dark_energy_model = PPF
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make
Regards