diff --git a/build.sh b/build.sh
index 70dddea..f244cd9 100755
--- a/build.sh
+++ b/build.sh
@@ -25,6 +25,10 @@ case "$OSTYPE" in
       echo 'Error: Homebrew is not installed. Please install it.' >&2
       exit 1
     fi
+    if ! [ -x "$(command -v clang)" ]; then
+      echo 'Error: clang not found. Please run xcode-select --install.' >&2
+      exit 1
+    fi
     export LDFLAGS="-L/opt/homebrew/opt/openssl@3/lib"
     export CPPFLAGS="-I/opt/homebrew/opt/openssl@3/include"
     ;;
diff --git a/setup.sh b/setup.sh
index 950c492..6e718c9 100755
--- a/setup.sh
+++ b/setup.sh
@@ -8,6 +8,10 @@ case "$OSTYPE" in
       echo 'Error: Homebrew is not installed. Please install it.' >&2
       exit 1
     fi
+    if ! [ -x "$(command -v clang)" ]; then
+      echo 'Error: clang not found. Please run xcode-select --install.' >&2
+      exit 1
+    fi
     brew install pkg-config openssl@3 poppler python
     ;;
   *linux*)