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The C89 and later standard defines the `<stdlib.h>` header as part of the standard headers [1] and on current systems it is always present and the `HAVE_STDLIB_H` symbol can be removed. Also Autoconf suggests doing this and relying on C89 or above [2] and [3]. [1] https://port70.net/~nsz/c/c89/c89-draft.html#4.1.2 [2] http://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/autoconf/headers.m4 [3] https://www.gnu.org/software/autoconf/manual/autoconf-2.69/autoconf.html