PX4 Toolchain set up issues

Hi all,
I am brand new to PX4 and am having a hard time setting up my toolchain for Mac. I get this error when I try and download it through the console.

curl: (6) Could not resolve host: homebrew.bintray.com
Error: Failed to download resource “tinyxml”
Download failed: https://homebrew.bintray.com/bottles/tinyxml-2.6.2.mojave.bottle.tar.gz
Warning: Bottle installation failed: building from source.
==> Downloading TinyXML - Browse Files at SourceForge.net

curl: (6) Could not resolve host: downloads.sourceforge.net
Error: An exception occurred within a child process:
DownloadError: Failed to download resource “tinyxml”
Download failed: https://downloads.sourceforge.net/project/tinyxml/tinyxml/2.6.2/tinyxml_2_6_2.tar.gz

Just tried to reinstall tinyxml with homebrew and it ran successfully (macOS Mojave 10.14.3), you might have problems with your homebrew install, try to run homebrew doctor and follow the output.

That solved that issue thanks! however now i am getting an issue when i enter brew install px4-sim to the console, i get this error. Any ideas? thanks so much.
BUILD ERRORS: These must be resolved before compiling.
– Boost not found. Please install thread signals system filesystem program_options regex date_time boost version 1.40.0 or higher.