add macos build instructions

README.md

@@ -10,11 +10,11 @@ Desktop app for securely storing sensitive files
 
 ## Building
 
-### Debian/Ubuntu
+### Debian
 ```
 sudo apt update && sudo apt install build-essential qt6-base-dev libbotan-3-dev cmake
 
-cmake -S . -B build
+cmake -B build
 cmake --build build -j $(nproc)
 ./build/dull
 ```
@@ -23,16 +23,25 @@ cmake --build build -j $(nproc)
 ```
 sudo pacman -Syu base-devel cmake qt6-base botan
 
-cmake -S . -B build
+cmake -B build
 cmake --build build -j $(nproc)
 ./build/dull
 ```
 
+### MacOS
+```
+brew install qtbase cmake pkg-config botan
+
+cmake -B build
+cmake --build build -j $(sysctl -n hw.physicalcpu)
+./build/dull
+```
+
 ### Windows (MSYS2)
 ```
 pacman -S --needed mingw-w64-x86_64-toolchain mingw-w64-x86_64-cmake mingw-w64-x86_64-ninja mingw-w64-x86_64-qt6-base mingw-w64-x86_64-qt6-tools mingw-w64-x86_64-libbotan
 
-cmake -S . -B build -DBOTAN_INCLUDE_DIRS=/mingw64/include/botan-3 -DBOTAN_LIBRARIES=/mingw64/lib/libbotan-3.a
+cmake -B build -DBOTAN_INCLUDE_DIRS=/mingw64/include/botan-3 -DBOTAN_LIBRARIES=/mingw64/lib/libbotan-3.a
 cmake --build build -j $(nproc)
 ./build/dull
 ```

src/mainwindow.cc

@@ -9,6 +9,7 @@
 #include <QMimeData>
 #include <QTemporaryDir>
 #include <botan/auto_rng.h>
+#include <botan/exceptn.h>
 
 MainWindow::MainWindow(QWidget *parent)
     : QMainWindow(parent), ui(std::make_unique<Ui::MainWindow>()) {