$NetBSD: patch-ad,v 1.12 2020/04/16 09:21:51 manu Exp $

--- configure.orig	2020-04-05 16:59:54.000000000 +0200
+++ configure	2020-04-14 10:31:20.723580801 +0200
@@ -3442,15 +3442,15 @@
 $as_echo "$ac_cv_prog_cc_g" >&6; }
 if test "$ac_test_CFLAGS" = set; then
   CFLAGS=$ac_save_CFLAGS
 elif test $ac_cv_prog_cc_g = yes; then
-  if test "$GCC" = yes; then
+  if test "X${GCC}" = "Xyes" ; then
     CFLAGS="-g -O2"
   else
     CFLAGS="-g"
   fi
 else
-  if test "$GCC" = yes; then
+  if test "X${GCC}" = "Xyes" ; then
     CFLAGS="-O2"
   else
     CFLAGS=
   fi
@@ -7462,18 +7462,18 @@
 fi
 
   fi
   if test x"$objc_threaded" = x""; then
-    LIBS="$OBJCRT $saved_LIBS -lthread "
+    LIBS="$OBJCRT $saved_LIBS ${OBJC_THREAD} "
     if test "$cross_compiling" = yes; then :
   objc_threaded=""
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include "config_thread.m"
 _ACEOF
 if ac_fn_c_try_run "$LINENO"; then :
-  objc_threaded="-lthread"
+  objc_threaded="${OBJC_THREAD}"
 else
   objc_threaded=""
 fi
 rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \