[Wien] compilation problems on AIX with xlf90

[Pavel Ondračka]

Dear WIEN2k list,

I'm trying to compile WIEN2k_13.1 on AIX with xlf90 compiler and I'm
getting lots of those errors:
(S) Expression or initial value must be evaluated at compile time.

Those are originating from expressions like this:
PARAMETER (PI=4D0*DATAN(1D0))

I can fix this by replacing the expression with numerical
representation:
PARAMETER (PI=3.14159265358979323D0)
however there are many of those errors and I'm wondering if there is any
better way to fix this?

Best regards
Pavel Ondračka