malloc: *** error for object 0x7fcc45001800: incorrect checksum for freed object - object was probably modified after being freed.

[LucasMW]

Got this after running
make

./miniruby -I./lib -I.ext/common -I./- -r./ext/purelib.rb "./tool/transcode-tblgen.rb" -vo "enc/trans/big5.c" "enc/trans/big5.trans"
miniruby(81325,0x7fff8ed82380) malloc: *** error for object 0x7fcc45001800: incorrect checksum for freed object - object was probably modified after being freed.
*** set a breakpoint in malloc_error_break to debug
make[4]: *** [enc/trans/big5.c] Abort trap: 6
make[3]: *** [srcs-enc] Error 2
make[2]: *** [ruby192-build] Error 2
make[1]: *** [../ruby192-build] Error 2
make: *** [all-recursive] Error 1

Attempted on Mac OS 10.13.6 (High Sierra)