remove unspported nanosleep and MSG_DONTWAIT in basis
F_OK can not be bitwise-ORed with R_OK,W_OK,etc on USS.
add LDFLAGS
Add a target to generate and tar the C source code of mlton-compile.
build ASCII XPLINK version of runtime
mremap() can be be replaced by realloc(), because the former keep the starting addres while the latter changes that.
No mremap().
Check the NULL pointer.