diff --git a/configure b/configure
index a9a283096..20a706ad4 100755
--- a/configure
+++ b/configure
@@ -7128,7 +7128,7 @@ fi
 set dummy thin_dump; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if ${ac_cv_path_THIN_DUMP_CMD+:} false; then :
+if test "${ac_cv_path_THIN_DUMP_CMD+set}" = set; then :
   $as_echo_n "(cached) " >&6
 else
   case $THIN_DUMP_CMD in
@@ -7142,7 +7142,7 @@ do
   IFS=$as_save_IFS
   test -z "$as_dir" && as_dir=.
     for ac_exec_ext in '' $ac_executable_extensions; do
-  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+  if { test -f "$as_dir/$ac_word$ac_exec_ext" && $as_test_x "$as_dir/$ac_word$ac_exec_ext"; }; then
     ac_cv_path_THIN_DUMP_CMD="$as_dir/$ac_word$ac_exec_ext"
     $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
     break 2
@@ -7180,7 +7180,7 @@ fi
 set dummy thin_repair; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if ${ac_cv_path_THIN_REPAIR_CMD+:} false; then :
+if test "${ac_cv_path_THIN_REPAIR_CMD+set}" = set; then :
   $as_echo_n "(cached) " >&6
 else
   case $THIN_REPAIR_CMD in
@@ -7194,7 +7194,7 @@ do
   IFS=$as_save_IFS
   test -z "$as_dir" && as_dir=.
     for ac_exec_ext in '' $ac_executable_extensions; do
-  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+  if { test -f "$as_dir/$ac_word$ac_exec_ext" && $as_test_x "$as_dir/$ac_word$ac_exec_ext"; }; then
     ac_cv_path_THIN_REPAIR_CMD="$as_dir/$ac_word$ac_exec_ext"
     $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
     break 2