http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60341
--- Comment #8 from Steve Chapel <schapel at umich dot edu> --- Yes, it's a regression from earlier versions of gfortran. I have verified that with the workaround, Nonmem 6.2.0 compiles and runs properly with optimization using gfortran 4.8.1 and 4.8.2. Turning optimization off also works.