DEVELOPMENT.md: on FreeBSD, install GNU coreutils package to build/ru…

…n tests

Signed-off-by: Laurent Cheylus <[email protected]>

DEVELOPMENT.md

@@ -1,4 +1,4 @@
-<!-- spell-checker:ignore (flags) Ccodegen Coverflow Cpanic Zinstrument Zpanic reimplementing toybox RUNTEST CARGOFLAGS nextest prereq autopoint gettext texinfo automake findutils shellenv libexec gnubin toolchains -->
+<!-- spell-checker:ignore (flags) Ccodegen Coverflow Cpanic Zinstrument Zpanic reimplementing toybox RUNTEST CARGOFLAGS nextest prereq autopoint gettext texinfo automake findutils shellenv libexec gnubin toolchains gsed -->
 
 # Setting up your local development environment
 
@@ -241,6 +241,12 @@ DEBUG=1 bash util/run-gnu-test.sh tests/misc/sm3sum.pl
 
 Note that GNU test suite relies on individual utilities (not the multicall binary).
 
+On FreeBSD, you need to install packages for GNU coreutils and sed (used in shell scripts instead of system commands):
+
+```shell
+pkg install coreutils gsed
+```
+
 ## Code coverage report
 
 Code coverage report can be generated using [grcov](https://github.com/mozilla/grcov).