Compiling mtr on Termux / Android

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$ cd docs/mtr
$ make
make  all-am
make[1]: Entering directory '/data/data/com.termux/files/home/docs/mtr'
  CCLD     mtr
ui/mtr-cmdpipe.o: In function `consume_reply_buffer':
/data/data/com.termux/files/home/docs/mtr/ui/cmdpipe.c:748: undefined reference to `index'
/data/data/com.termux/files/home/docs/mtr/ui/cmdpipe.c:748: undefined reference to `index'
ui/mtr-asn.o: In function `get_ipinfo':
/data/data/com.termux/files/home/docs/mtr/ui/asn.c:258: undefined reference to `hsearch'
/data/data/com.termux/files/home/docs/mtr/ui/asn.c:272: undefined reference to `hsearch'
ui/mtr-asn.o: In function `asn_open':
/data/data/com.termux/files/home/docs/mtr/ui/asn.c:320: undefined reference to `hcreate'
ui/mtr-asn.o: In function `asn_close':
/data/data/com.termux/files/home/docs/mtr/ui/asn.c:330: undefined reference to `hdestroy'
ui/mtr-curses.o: In function `format_field':
/data/data/com.termux/files/home/docs/mtr/ui/curses.c:387: undefined reference to `index'
clang-5.0: error: linker command failed with exit code 1 (use -v to see invocation)
make[1]: *** [Makefile:788: mtr] Error 1
make[1]: Leaving directory '/data/data/com.termux/files/home/docs/mtr'
make: *** [Makefile:642: all] Error 2
$