https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117258
--- Comment #4 from David Binderman <dcb314 at hotmail dot com> --- Even more mysterious: elk-9.2.12 $ find . -name \*.f90 -print | xargs grep xc_f03_lib_m ./src.orig/libxcifc.f90:use xc_f03_lib_m ./src/libxcifc.f90:use xc_f03_lib_m elk-9.2.12 $ I even tried: elk-9.2.12 $ find . -type f -print | xargs grep xc_f03_lib_m ./src.orig/libxcifc.f90:use xc_f03_lib_m ./src/libxcifc.f90:use xc_f03_lib_m elk-9.2.12 $ My working assumption is that the xc_f03_lib_m identifier is provided by some library the compiler accesses somehow. Would trying to duplicate a build of the entire package be easier ?