Add Building-on-macOS-Sequoia.md

wiki/Building-on-macOS-Sequoia.md

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+# MacOSX 15.5, qt6, gcc 15
+
+## Includes and linker options
+
+Linker and includes have to be set to the main ones from homebrew and the qt ones:
+
+```shell
+export LDFLAGS="-L${homebrew_dir}/lib $LDFLAGS"
+export CPPFLAGS="-I${homebrew_dir}/include $CPPFLAGS"
+
+# qt
+export QT_ROOT=/opt/qt/6.8.2/macos # change to match yours 
+export LDFLAGS="$LDFLAGS -L$QT_ROOT/lib"
+export CPPFLAGS="$CPPFLAGS -I$QT_ROOT/include"
+
+export CXXFLAGS=$CPPFLAGS
+```
+
+## Add `qt6` tools to PATH
+
+```shell
+export PKG_CONFIG_PATH="$PKG_CONFIG_PATH:$QT_ROOT/lib/pkgconfig"
+export PATH="$QT_ROOT/bin:$PATH"
+```
+
+## Customizing `cmake`
+
+Then install two more dependencies.
+
+```shell
+brew install ninja googletest # or sudo port install ninja gtest
+```
+
+At this point you can run (use `--fresh` if you already have it set up):
+
+```shell
+cmake -D CMAKE_INSTALL_PREFIX=/usr            \
+      -D CMAKE_BUILD_TYPE=None                \
+      -D CMAKE_OSX_SYSROOT=$(xcrun --sdk macosx --show-sdk-path) \
+      -D CMAKE_OSX_DEPLOYMENT_TARGET=10.15    \
+      -D CMAKE_C_FLAGS="${CFLAGS}"            \
+      -D CMAKE_CXX_FLAGS="${CXXFLAGS}"        \
+      -D INPUTLEAP_BUILD_LIBEI=ON             \
+      -D INPUTLEAP_USE_EXTERNAL_GTEST=ON      \
+      -D INPUTLEAP_BUILD_GULRAK_FILESYSTEM=ON \
+      -D INPUTLEAP_VERSION_STAGE=Release      \
+      -W no-dev -G Ninja -B build -S .
+```
+
+Finally, build with the usual:
+
+```
+cmake --build build
+```