_POSIX_C_SOURCE 21 src/dps8/dps8_duma.h # define _POSIX_C_SOURCE 1 _POSIX_C_SOURCE 49 src/simh/linehistory.c # define _POSIX_C_SOURCE 200809L _POSIX_C_SOURCE 49 src/simh/linehistory.h # define _POSIX_C_SOURCE 200809L