What happened to this once so great compiler? Since v17 and now in 18beta so many things are broken? How could that happen? I will try to come up with a list of issues, but I'm really frustrated. The full test case is here: http://www.hepforge.org/archive/whizard/whizard-2.4.1.tar.gz
Note that you need OCaml besides the ifort compiler. Just do configure, make, and then make check. 4 of 114 unit tests fail, and 127 of 224 functional tests. I'm not yet sure whether these are the same issue(s) that I already reported for the 17.0.X version of ifort. I will try to reduce this.