brew install gr-gsm failed for v0.42.2

[lgxz]

macOS Mojave 10.14.1

url "https://github.com/ptrkrysik/gr-gsm/archive/v0.42.2.tar.gz"
sha256 "6127f87c1d295463c607a27cc2fc560e7a2b8684c1b0be10256db06936769976"

brew install gr-gsm

/tmp/gr-gsm-20181127-31126-xqnd85/gr-gsm-0.42.2/lib/transmitter/txtime_setter_impl.cc:125:29: error: use of undeclared identifier 'be32toh'
uint32_t frame_nr = be32toh(header->frame_number);
^
1 error generated.
make[2]: *** [lib/CMakeFiles/grgsm.dir/transmitter/txtime_setter_impl.cc.o] Error 1
make[1]: *** [lib/CMakeFiles/grgsm.dir/all] Error 2
make: *** [all] Error 2