build the SDL on linux

build.sh

@@ -7,6 +7,22 @@ if [ -v release ];   then echo "[release build]"; fi
 if [ -v slow ];      then echo "[slow build]";    fi
 
 mkdir -p build
+
+if [ ! -e "src/external/SDL" ]; then
+    cd src/external
+    git clone https://github.com/libsdl-org/SDL.git
+    cd SDL
+    git checkout release-3.4.0
+    cmake -S . -B build_linux -DCMAKE_BUILD_TYPE=Release -DSDL_PIPEWIRE=OFF
+    # cmake -S . -B build_linux -DSDL_PIPEWIRE=OFF -DCMAKE_BUILD_TYPE=Debug
+    cd build_linux
+    make -j16
+    LIB=$(readlink -f libSDL3.so)
+    cp $LIB ../../../../build/libSDL3.so
+    cp *.a ../../../../build/.
+    cd ../../../../
+fi
+
 cd build
 
 I="-I../src/external/SDL/include -I../src/external/lua/src -I../src/external/glad -I../src"