diff --git a/linux-tkg-config/prepare b/linux-tkg-config/prepare
index fed6a10..975d832 100644
--- a/linux-tkg-config/prepare
+++ b/linux-tkg-config/prepare
@@ -383,18 +383,23 @@ _set_compiler(){
 
 _define_kernel_abs_paths() {
 
-  _kernel_work_folder_abs="$_where/$_kernel_work_folder/linux-src-git"
-  if [[ "$_kernel_work_folder" == /* ]]; then
-    _kernel_work_folder_abs="$_kernel_work_folder/linux-tkg/linux-src-git"
-  fi
-  echo -e "_kernel_work_folder_abs=\"$_kernel_work_folder_abs\"" >> "$_where"/BIG_UGLY_FROGMINER
+  source "$_where"/BIG_UGLY_FROGMINER
 
-  _kernel_source_folder_abs="$_where/$_kernel_source_folder/linux-kernel.git"
-  if [[ "$_kernel_source_folder" == /* ]]; then
-    _kernel_source_folder_abs="$_kernel_source_folder/linux-tkg/linux-kernel.git"
+  if [ -n "$_kernel_work_folder_abs" ]; then
+    _kernel_work_folder_abs="$_where/$_kernel_work_folder/linux-src-git"
+    if [[ "$_kernel_work_folder" == /* ]]; then
+      _kernel_work_folder_abs="$_kernel_work_folder/linux-tkg/linux-src-git"
+    fi
+    echo -e "_kernel_work_folder_abs=\"$_kernel_work_folder_abs\"" >> "$_where"/BIG_UGLY_FROGMINER
   fi
-  echo -e "_kernel_source_folder_abs=\"$_kernel_source_folder_abs\"" >> "$_where"/BIG_UGLY_FROGMINER
 
+  if [ -n "$_kernel_source_folder_abs" ]; then
+    _kernel_source_folder_abs="$_where/$_kernel_source_folder/linux-kernel.git"
+    if [[ "$_kernel_source_folder" == /* ]]; then
+      _kernel_source_folder_abs="$_kernel_source_folder/linux-tkg/linux-kernel.git"
+    fi
+    echo -e "_kernel_source_folder_abs=\"$_kernel_source_folder_abs\"" >> "$_where"/BIG_UGLY_FROGMINER
+  fi
 }