#C89_SOURCE=-ansi
--#POSIX_SOURCE=-D_POSIX_SOURCE
-+POSIX_SOURCE=-D_POSIX_SOURCE -D_POSIX_C_SOURCE=200112
+-#POSIX_SOURCE=-D_POSIX_C_SOURCE=200112L
++POSIX_SOURCE=-D_POSIX_C_SOURCE=200112L
# Most systems
-#XOPEN_SOURCE=-D_XOPEN_SOURCE -D_XOPEN_SOURCE_EXTENDED
-+XOPEN_SOURCE=$(POSIX_SOURCE) -D_XOPEN_SOURCE -D_XOPEN_SOURCE_EXTENDED
++XOPEN_SOURCE=-D_XOPEN_SOURCE -D_XOPEN_SOURCE_EXTENDED
# SunOS, (Irix)
#XOPEN_SOURCE=-D__EXTENSIONS__