Fix: command not found in automatic build

Author: mikolajkapica

build.sh

@@ -89,11 +89,14 @@ else
     echo "Virtualbox images will not be built."
 fi
 
-if compare_versions $($packer_bin -v) $min_packer_ver false; then
+# Get element after "Packer" or first if only version is present (handles older versions)
+packer_version=$(echo "$packer_bin" | awk '{if (NF > 1 && $1 == "Packer") print $2; else print $1}')
+
+if compare_versions $($packer_version) $min_packer_ver false; then
     echo "Compatible version of $packer_bin was found."
 else
     packer_bin=packer
-    if compare_versions $($packer_bin -v) $min_packer_ver false; then
+    if compare_versions $($packer_version) $min_packer_ver false; then
         echo "Compatible version of $packer_bin was found."
     else
         echo "Compatible version of packer was not found. Please install from here: https://www.packer.io/downloads.html"