gfatx: Update README for qt6

Author: mborgerson

gfatx/README.md

@@ -9,7 +9,7 @@ Note: This tool is in a very early state, and only has the functionality to brow
 
 ## Build on Ubuntu
 ```
-sudo apt install qt5-default
+sudo apt install build-essential pkg-config cmake git qt6-base-dev qt6-tools-dev qt6-tools-dev-tools
 cd /path/to/fatx
 mkdir build
 cd build
@@ -19,8 +19,8 @@ make gfatx
 
 ## Build on Windows
 * Install Visual Studio 2019 Community
-* Install Qt 5.15.2. I recommend using the Qt open source online installer.
-* From Start menu, launch a "Qt 5.15.2 + MSVC 2019" command prompt
+* Install Qt 6. I recommend using the Qt open source online installer.
+* From Start menu, launch a "Qt 6.x.x + MSVC 2019" command prompt
 
 ```
 "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvars32.bat" amd64
@@ -33,11 +33,11 @@ cmake --build . --target gfatx
 
 ## Build on macOS
 ```
-brew install pkgconfig qt@5
-export PATH="/usr/local/opt/qt@5/bin:$PATH"
-export LDFLAGS="-L/usr/local/opt/qt@5/lib"
-export CPPFLAGS="-I/usr/local/opt/qt@5/include"
-export PKG_CONFIG_PATH="/usr/local/opt/qt@5/lib/pkgconfig"
+brew install pkgconfig qt@6
+export PATH="/usr/local/opt/qt@6/bin:$PATH"
+export LDFLAGS="-L/usr/local/opt/qt@6/lib"
+export CPPFLAGS="-I/usr/local/opt/qt@6/include"
+export PKG_CONFIG_PATH="/usr/local/opt/qt@6/lib/pkgconfig"
 cd /path/to/fatx
 mkdir build
 cd build