On 05/13/2013 02:08 PM, Pritchett-Sheats, Lori wrote: > IMPLICIT_DEPENDS Fortran "${F_file}" The custom command is running a C preprocessor, not a Fortran compiler, so use "IMPLICIT_DEPENDS C". > list(APPEND PGSLibIface_SOURCE_FILES ${new_file_f90}) Do you mean to append to F90Library_SOURCE_FILES here? -Brad