Prompt to build the toolchain if it doesn't exist.

util/activate.sh

@@ -3,8 +3,13 @@
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
 if [ ! -e "$DIR/local/bin/i686-pc-toaru-gcc" ]; then
-    echo "Toolchain has not been built. Please run \`bash util/build-gcc.sh\`." >&2
-    exit 1
+    echo -n "Toolchain has not been built. Would you like to build it now? (y/n) " >&2
+    read response
+    case $response in
+        [yY]) bash $DIR/build-gcc.sh ;;
+        [nN]) exit 1 ;;
+        *)
+    esac
 fi
 
 export PATH="$DIR/local/bin:$PATH"