Update getting-started.md (#378)

Author: sbryngelson

README.md

@@ -50,20 +50,26 @@ Another example is the high-Mach flow over an airfoil, shown below.
 
 You can navigate [to this webpage](https://mflowcode.github.io/documentation/md_getting-started.html) to get started using MFC!
 It's rather straightforward.
-
 We'll give a brief intro. here for MacOS.
 Using [brew](https://brew.sh), install MFC's modest set of dependencies:
 ```console
-brew install wget make python make cmake coreutils gcc mpich
+brew install wget python cmake gcc@13 mpich
 ```
 You're now ready to build and test MFC!
-Clone it to a convenient directory via
+Put it to a convenient directory via
 ```console
 git clone https://github.com/mflowcode/MFC.git
 cd MFC
 ```
-then build and test!
+and make sure MFC knows what compilers to use by putting the following in your `~/.profile`
+```console
+export CC=gcc-13
+export CXX=g++-13
+export FC=gfortran-13
+```
+and source that file, build, and test!
 ```console
+source ~/.profile
 ./mfc.sh build -j 8
 ./mfc.sh test -j 8
 ```

docs/documentation/getting-started.md

@@ -30,7 +30,8 @@ sudo apt update
 sudo apt upgrade
 sudo apt install tar wget make cmake gcc g++ \
                    python3 python3-dev         \
-                   "openmpi-*" libopenmpi-dev
+                   "openmpi-*" libopenmpi-dev \
+                   python3-venv
 ```
 
 - **Via [Pacman](https://wiki.archlinux.org/title/pacman):**
@@ -120,7 +121,7 @@ export FC=gfortran-$MFC_GCC_VER
 **Close the open editor and terminal window**. Open a **new terminal** window before executing the commands below.
 
 ```console
-brew install wget make python make cmake coreutils gcc@$MFC_GCC_VER mpich
+brew install wget python cmake gcc@$MFC_GCC_VER mpich
 ```
 
 They will download the dependencies MFC requires to build itself.