Courtesy of Refael Yaari <rafix@mail.cern.ch> I have received the following 
information on how TAUOLA and PHOTOS perform under G95 compiler. So far 
I have no personal experience with this compiler at all.

In case of PHOTOS no intervention was needed in case of TAUOLA the following 
points required action:

        Compilation errors in tauola/27.121.2 ,when compiling with G95 compiler
        -----------------------------------------------------------------1/7/06

1) In fa1a1p.f    There  is a line of mixed Declaration and data  .
                 The G95 requires separate lines for it 
                e.g
                    Integer ifirst /0/   ! declare Integer + assign value
          --->      Integer ifirst
          --->      DATA   ifirst /0/

   (This is an "old" drawback ,which so far wasn't resolved by any
    means of compiler option !)

2) In taueta.F   , there is a Bug ,which on some platforms might not
        show big differences ,but on some othres it might !!!

       An internal function ,XLAM(a,b,c)=....
       is defined as REAL*8 function, and so are the arguments.
       But, when it's being called, actually, twice,
       1 argument is AM2 and that isn't REAL*8  it has the default type
      of REAL*4
         In short, there is a mismatch between the type of the arguments!!!
       And it has to be rectified !!