diff --git a/ChangeLog b/ChangeLog
index 689cd88ca..2b786c762 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,6 +2,8 @@
 
 	* Source/NSThread.m: Improve exception message when performing a
 	selector on a finished thread.
+	* configure.ac: Fix for older versions of pkg-config
+	* configure: regenerate
 
 2018-01-14  Yavor Doganov  <yavor@gnu.org>
  
diff --git a/configure b/configure
index e9c77b0a7..9fb74989c 100755
--- a/configure
+++ b/configure
@@ -715,6 +715,7 @@ ac_cv_sizeof_short
 GS_UINT8
 GS_SINT8
 GS_WORDS_BIGENDIAN
+PKG_CONFIG
 WHOAMI
 EGREP
 GREP
@@ -5789,6 +5790,51 @@ fi
 
 
 PKG_PROG_PKG_CONFIG
+# If the modern mechanism failswe may havew an older pkg-config
+# so try looking it up the old fashioned way.
+if test -z "$PKG_CONFIG"; then
+  # Extract the first word of "pkg-config", so it can be a program name with args.
+set dummy pkg-config; 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_PKG_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $PKG_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_PKG_CONFIG="$PKG_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$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
+    ac_cv_path_PKG_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+PKG_CONFIG=$ac_cv_path_PKG_CONFIG
+if test -n "$PKG_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $PKG_CONFIG" >&5
+$as_echo "$PKG_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+fi
+
 
 #--------------------------------------------------------------------
 # specific target_os options
diff --git a/configure.ac b/configure.ac
index dc2497134..b088bdd79 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1211,6 +1211,12 @@ AC_LANG_POP(C)
 
 AC_PATH_PROG(WHOAMI, whoami, echo, $PATH:/usr/ucb)
 PKG_PROG_PKG_CONFIG
+# If the modern mechanism failswe may havew an older pkg-config
+# so try looking it up the old fashioned way.
+if test -z "$PKG_CONFIG"; then
+  AC_PATH_PROG(PKG_CONFIG,pkg-config,,)
+fi
+
 
 #--------------------------------------------------------------------
 # specific target_os options