Getting past an error installing gdal and postgis in Mac OS X with Homebrew

installing_gdal_mac

`brew install postgis`

But you don't have gdal installed (a dependency) so brew trys to install gdal aaand...

Fails with: `'gcc-4.2' failed with exit status 1`

Solutuion: Run brew install in verbose mode

`brew install -vd postgis` or `brew install -vd gdal`

This'll take longer but will prompt you with the error causing postgis to hang:

```
BuildError: Failed executing: /usr/local/bin/python setup.py install --prefix=/usr/local/Cellar/gdal/1.10.0 --record=installed.txt --single-version-externally-managed
1. raise
2. ignore
3. backtrace
4. shell
Choose an action:
```

Hit `2` to ignore this error and gdal will install!