Hi, there is another glitch with Fortran on HP-UX 11.11. When mixing C and Fortran source files, it is convenient to include config.h in .F files when some symbols have to be checked. But F77_FUNC prints a two-line comment in config.h, which is not discarded by HP Fortran preprocessor, and compiler fails. A workaround is to write m4_pushdef([m4_text_wrap]) AC_F77_WRAPPERS m4_popdef([m4_text_wrap]) to make m4_text_wrap quiet, but is there a better solution? Denis