diff --git a/AppImage-build-debian-inner.sh b/AppImage-build-debian-inner.sh
index 969e573be..4fe60f99b 100755
--- a/AppImage-build-debian-inner.sh
+++ b/AppImage-build-debian-inner.sh
@@ -15,22 +15,24 @@ ulimit -n 50000
 # Install dependencies
 apt -y install cmake ninja-build build-essential autoconf pkg-config locales wget git file mold libtool lsb-release wget software-properties-common gnupg \
                qtbase5-dev qtmultimedia5-dev qtbase5-private-dev glslang-tools libssl-dev libavcodec-dev libavfilter-dev libavutil-dev libswscale-dev libpulse-dev libasound2-dev
-if ! [ "$BUILD_USE_CPM" = 1 ]; then
+if [ ! "$BUILD_USE_CPM" = 1 ]; then
     apt -y install libfmt-dev libenet-dev liblz4-dev nlohmann-json3-dev zlib1g-dev libopus-dev libsimpleini-dev libstb-dev libzstd-dev libusb-1.0-0-dev libcubeb-dev libcpp-jwt-dev libvulkan-dev gamemode-dev libasound2-dev libglu1-mesa-dev libxext-dev mesa-common-dev libva-dev
 
-    # Install Boost
-    wget https://archives.boost.io/release/1.88.0/source/boost_1_88_0.tar.bz2
-    echo "Extracting Boost sources..."
-    tar xf boost_1_88_0.tar.bz2
-    cd boost_1_88_0
-    ./bootstrap.sh
-    ./b2 install --with-{headers,context} link=static
-    cd ..
-    rm -rf boost_1_88_0 boost_1_88_0.tar.bz2
+    if [ ! -f /usr/local/lib/cmake/Boost-1.88.0/BoostConfigVersion.cmake ]; then
+        # Install Boost
+        wget https://archives.boost.io/release/1.88.0/source/boost_1_88_0.tar.bz2
+        echo "Extracting Boost sources..."
+        tar xf boost_1_88_0.tar.bz2
+        cd boost_1_88_0
+        ./bootstrap.sh
+        ./b2 install --with-{headers,context} link=static
+        cd ..
+        rm -rf boost_1_88_0 boost_1_88_0.tar.bz2
+    fi
 fi
 
 # Install Clang
-if ! clang-19 --version; then
+if ([ "$BUILD_USE_CLANG" = 1 ] && ! clang-19 --version); then
     cd /tmp
     wget https://apt.llvm.org/llvm.sh
     chmod +x llvm.sh
@@ -46,11 +48,17 @@ mount -t overlay overlay -olowerdir=torzu-src-ro,upperdir=torzu-src-upper,workdi
 # Get extra configuration/compilation options
 EXTRA_COMPILE_FLAGS=""
 EXTRA_CMAKE_FLAGS=""
+if [ "$BUILD_USE_CLANG" = 1 ]; then
+    EXTRA_CMAKE_FLAGS="$EXTRA_CMAKE_FLAGS -DCMAKE_C_COMPILER=clang-19 -DCMAKE_CXX_COMPILER=clang++-19"
+    FATLTO_FLAG="-flto=full"
+else
+    FATLTO_FLAG="-flto"
+fi
 if [ "$BUILD_USE_THIN_LTO" = 1 ]; then
     EXTRA_COMPILE_FLAGS="-flto=thin"
 fi
 if [ "$BUILD_USE_FAT_LTO" = 1 ]; then
-    EXTRA_COMPILE_FLAGS="-flto=full"
+    EXTRA_COMPILE_FLAGS="$FATLTO_FLAG"
 fi
 if [ "$BUILD_USE_CPM" = 1 ]; then
     EXTRA_CMAKE_FLAGS="-DYUZU_USE_CPM=ON"
@@ -60,7 +68,7 @@ fi
 cd /tmp
 mkdir torzu-build
 cd torzu-build
-cmake /tmp/torzu-src -GNinja -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=clang-19 -DCMAKE_CXX_COMPILER=clang++-19 -DYUZU_TESTS=OFF -DENABLE_QT_TRANSLATION=OFF -DSPIRV_WERROR=OFF -DCMAKE_FIND_LIBRARY_SUFFIXES=".a;.so" -DSPIRV-Headers_SOURCE_DIR=/tmp/torzu-src/externals/SPIRV-Headers -DCMAKE_{C,CXX}_FLAGS="${EXTRA_COMPILE_FLAGS} -fdata-sections -ffunction-sections" -DCMAKE_{EXE,SHARED}_LINKER_FLAGS="-Wl,--gc-sections" $EXTRA_CMAKE_FLAGS
+cmake /tmp/torzu-src -GNinja -DCMAKE_BUILD_TYPE=Release -DYUZU_TESTS=OFF -DENABLE_QT_TRANSLATION=OFF -DSPIRV_WERROR=OFF -DCMAKE_FIND_LIBRARY_SUFFIXES=".a;.so" -DSPIRV-Headers_SOURCE_DIR=/tmp/torzu-src/externals/SPIRV-Headers -DCMAKE_{C,CXX}_FLAGS="${EXTRA_COMPILE_FLAGS} -fdata-sections -ffunction-sections" -DCMAKE_{EXE,SHARED}_LINKER_FLAGS="-Wl,--gc-sections" $EXTRA_CMAKE_FLAGS
 ninja || (
     echo "Compilation has failed. Dropping you into a shell so you can inspect the situation. Run 'ninja' to retry and exit shell once compilation has finished successfully."
     echo "Note that any changes made here will not be reflected to the host environment, but changes made from the host environment will be reflected here."
diff --git a/AppImage-build-debian.sh b/AppImage-build-debian.sh
index 21f5e4810..73fd10177 100755
--- a/AppImage-build-debian.sh
+++ b/AppImage-build-debian.sh
@@ -5,6 +5,10 @@ set -e
 for i in "$@"
 do
 case $i in
+    -l|--clang)
+        export BUILD_USE_CLANG=1
+        echo "-> Using Clang for compilation."
+    ;;
     -o|--thin-lto)
         export BUILD_USE_THIN_LTO=1
         echo "-> Thin link time optimization enabled."
@@ -22,12 +26,22 @@ case $i in
         echo "-> Not deleting rootfs after successful build."
     ;;
     *)
-        echo "Usage: $0 [--thin-lto/-o] [--fat-lto/-O] [--use-cpm/-p] [--keep-rootfs/-k]"
+        echo "Usage: $0 [--clang/-l] [--thin-lto/-o] [--fat-lto/-O] [--use-cpm/-p] [--keep-rootfs/-k]"
         exit 1
     ;;
 esac
 done
 
+# Make sure options are valid
+if [ "$BUILD_USE_THIN_LTO" = 1 ] && [ "$BUILD_USE_CLANG" != 1 ]; then
+    echo "Thin LTO can't be used without Clang!"
+    exit 2
+fi
+if [ "$BUILD_USE_THIN_LTO" = 1 ] && [ "$BUILD_USE_FAT_LTO" = 1 ]; then
+    echo "Only either thin or fat LTO can be used!"
+    exit 2
+fi
+
 # Get torzu source dir
 TORZU_SOURCE_DIR="$(realpath "$(dirname "${BASH_SOURCE[0]}")")"
 echo "-> Source dir is $TORZU_SOURCE_DIR"