wmake-with-bear doesn't work with macOS properly

Summary

wmake-with-bear doesn't work with macOS properly

Steps to reproduce

Use the patch provided by https://github.com/mrklein/openfoam-os-x (tested with normal installation, no problem).

$ brew install bear
$ bear --version
bear 3.0.8
$ ./Allwmake -with-bear > log.Allwmake 2>&1

Example case

What is the current bug behaviour?

sed: 1: "1{ s/^[^0-9]*\([1-9]\)/ ...": bad flag in substitute command: '}'
Warning: bear not found
Stopping

This is caused by the macOS variant of sed.

Need to install gnu-sed in Homebrew and add PATH="/usr/local/opt/gnu-sed/libexec/gnubin:$PATH"

However installing too many conflicting packages is not a good idea.

What is the expected correct behavior?

Relevant logs and/or images

Environment information

• OpenFOAM version : v2012
• Operating system : macOS
• Hardware info : x86
• Compiler : Clang

Possible fixes

Implement a universal command (or consider awk) to extract the version number.

For example, removing the curly brackets {} works in macOS.