diff --git a/autogen.sh b/autogen.sh
index acebc2381a3..ce622dcf9af 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -137,6 +137,13 @@ if $do_autoconf; then
 
   if $do_check; then
 
+    if test -n "$NIX_STORE"; then
+      echo "DEBUG:"
+      set
+      ls -l /proc/$$/exe
+      echo "DEBUG"
+    fi
+
     echo 'Checking whether you have the necessary tools...
 (Read INSTALL.REPO for more details on building Emacs)'