diff --git a/platforms/linux/x64/external.sh b/platforms/linux/x64/external.sh
index d3e54961c..34496c6e3 100755
--- a/platforms/linux/x64/external.sh
+++ b/platforms/linux/x64/external.sh
@@ -35,8 +35,8 @@ CACHE_NAME="SDL-${SDL_VERSION}_002"
 
 if [ ! -f "../${CACHE_DIR}/${CACHE_NAME}.cache" ]; then
    curl -sL https://github.com/libsdl-org/SDL/releases/download/preview-${SDL_VERSION}/SDL3-${SDL_VERSION}.tar.xz -o SDL3-${SDL_VERSION}.tar.xz
-   tar -xf SDL3-3.1.3.tar.xz
-   cd SDL3-3.1.3
+   tar -xf SDL3-${SDL_VERSION}.tar.xz
+   cd SDL3-${SDL_VERSION}
    cmake \
       -DSDL_SHARED=ON \
       -DSDL_STATIC=OFF \
diff --git a/platforms/osx/x64/external.sh b/platforms/osx/x64/external.sh
index d3e54961c..96904c719 100755
--- a/platforms/osx/x64/external.sh
+++ b/platforms/osx/x64/external.sh
@@ -4,7 +4,7 @@ set -e
 
 SDL_VERSION=3.1.3
 
-NUM_PROCS=$(nproc)
+NUM_PROCS=$(sysctl -n hw.ncpu)
 
 echo "Building external libraries..."
 echo "  SDL_VERSION: ${SDL_VERSION}"
@@ -35,8 +35,8 @@ CACHE_NAME="SDL-${SDL_VERSION}_002"
 
 if [ ! -f "../${CACHE_DIR}/${CACHE_NAME}.cache" ]; then
    curl -sL https://github.com/libsdl-org/SDL/releases/download/preview-${SDL_VERSION}/SDL3-${SDL_VERSION}.tar.xz -o SDL3-${SDL_VERSION}.tar.xz
-   tar -xf SDL3-3.1.3.tar.xz
-   cd SDL3-3.1.3
+   tar -xf SDL3-${SDL_VERSION}.tar.xz
+   cd SDL3-${SDL_VERSION}
    cmake \
       -DSDL_SHARED=ON \
       -DSDL_STATIC=OFF \