Building on a Mac

I am trying to build crosstool-NG on my mac ( Catalina -- 10.15.7 ).

After executing *ct-ng build*, I eventually get the errors below. How can I
workaround or resolve this issue? I am assuming I do not have something
configured correctly.


[EXTRA]    Building cross gdb
[ERROR]
 /Volumes/thedrive/build/x86_64-unknown-linux-gnu/src/gdb/readline/rltty.c:83:7:
error: implicit declaration of function 'ioctl' is invalid in C99
[-Werror,-Wimplicit-function-declaration]
[ERROR]
 /Volumes/thedrive/build/x86_64-unknown-linux-gnu/src/gdb/readline/rltty.c:720:3:
error: implicit declaration of function 'ioctl' is invalid in C99
[-Werror,-Wimplicit-function-declaration]
[ERROR]
 /Volumes/thedrive/build/x86_64-unknown-linux-gnu/src/gdb/readline/rltty.c:759:3:
error: implicit declaration of function 'ioctl' is invalid in C99
[-Werror,-Wimplicit-function-declaration]
[ERROR]    make[3]: *** [Makefile:97: rltty.o] Error 1
[ERROR]    make[3]: *** Waiting for unfinished jobs....
[ERROR]    make[2]: *** [Makefile:7804: all-readline] Error 2
[ERROR]    make[2]: *** Waiting for unfinished jobs....
[ERROR]    make[1]: *** [Makefile:879: all] Error 2
[ERROR]
[ERROR]  >>
[ERROR]  >>  Build failed in step 'Installing cross-gdb'
[ERROR]  >>        called in step '(top-level)'
[ERROR]  >>
[ERROR]  >>  Error happened in: CT_DoExecLog[scripts/functions@376]
[ERROR]  >>        called from:
do_gdb_backend[scripts/build/debug/300-gdb.sh@281]
[ERROR]  >>        called from:
do_debug_gdb_build[scripts/build/debug/300-gdb.sh@59]
[ERROR]  >>        called from: do_debug[scripts/build/debug.sh@35]
[ERROR]  >>        called from: main[scripts/crosstool-NG.sh@696]
[ERROR]  >>
[ERROR]  >>  For more info on this error, look at the file: 'build.log'
[ERROR]  >>  There is a list of known issues, some with workarounds, in:
[ERROR]  >>      https://crosstool-ng.github.io/docs/known-issues/
[ERROR]  >>
[ERROR]  >>  If you feel this is a bug in crosstool-NG, report it at:
[ERROR]  >>      https://github.com/crosstool-ng/crosstool-ng/issues/
[ERROR]  >>
[ERROR]  >>  Make sure your report includes all the information pertinent
to this issue.
[ERROR]  >>  Read the bug reporting guidelines here:
[ERROR]  >>      http://crosstool-ng.github.io/support/
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