uses an automatically-balancing tree algorithm, like the glibc version
does. Simple binary trees may perform badly.
-If you change the m4 input files in regress/ you may need GNU m4.
+You will need an m4 that supports: -P, -I, patsubst, ifelse, include,
+translit, and len.
You will probably find that GNU Make is required.
Please do not report this as a bug; install GNU Make instead.