--- /dev/null
+From 12a10bcfb1999d07961206587d79ce27c432c6ce Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Micha=C5=82=20K=C4=99pie=C5=84?= <michal@isc.org>
+Date: Tue, 27 Oct 2020 12:40:45 +0100
+Subject: [PATCH] Fix cross-compilation
+
+Using AC_RUN_IFELSE() in configure.ac breaks cross-compilation:
+
+ configure: error: cannot run test program while cross compiling
+
+Commit 978c7b2e89aa37a7ddfe2f6b6ba12ce73dd04528 caused AC_RUN_IFELSE()
+to be used instead of AC_LINK_IFELSE() because the latter had seemingly
+been causing the check for --wrap support in the linker to not work as
+expected. However, it later turned out that the problem lied elsewhere:
+a minus sign ('-') was missing from the LDFLAGS variable used in the
+relevant check [1].
+
+Revert to using AC_LINK_IFELSE() for checking whether the linker
+supports the --wrap option in order to make cross-compilation possible
+again.
+
+Fixes: https://gitlab.isc.org/isc-projects/bind9/-/issues/2237
+
+[1] see commit cfa4ea64bc06685f210a4187dcc05cc0aac84851
+---
+ configure | 16 ++++------------
+ configure.ac | 2 +-
+ 2 files changed, 5 insertions(+), 13 deletions(-)
+
+diff --git a/configure b/configure
+index a408f0dcf6..7694a18c0b 100755
+--- a/configure
++++ b/configure
+@@ -22047,13 +22047,7 @@ $as_echo_n "checking for linker support for --wrap option... " >&6; }
+
+
+ LDFLAGS="-Wl,--wrap,exit"
+-if test "$cross_compiling" = yes; then :
+- { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+-$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+-as_fn_error $? "cannot run test program while cross compiling
+-See \`config.log' for more details" "$LINENO" 5; }
+-else
+- cat confdefs.h - <<_ACEOF >conftest.$ac_ext
++cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+ /* end confdefs.h. */
+ #include <stdlib.h>
+ void __real_exit (int status);
+@@ -22067,7 +22061,7 @@ exit (1);
+ return 0;
+ }
+ _ACEOF
+-if ac_fn_c_try_run "$LINENO"; then :
++if ac_fn_c_try_link "$LINENO"; then :
+ LD_WRAP_TESTS=true
+
+ $as_echo "#define LD_WRAP 1" >>confdefs.h
+@@ -22078,10 +22072,8 @@ else
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+ $as_echo "no" >&6; }
+ fi
+-rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
+- conftest.$ac_objext conftest.beam conftest.$ac_ext
+-fi
+-
++rm -f core conftest.err conftest.$ac_objext \
++ conftest$ac_exeext conftest.$ac_ext
+
+ CCASFLAGS=$CCASFLAGS_wrap_ax_save_flags
+
+diff --git a/configure.ac b/configure.ac
+index 1201b5e2a7..9648d9727a 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -2247,7 +2247,7 @@ LD_WRAP_TESTS=false
+ AC_MSG_CHECKING([for linker support for --wrap option])
+ AX_SAVE_FLAGS([wrap])
+ LDFLAGS="-Wl,--wrap,exit"
+-AC_RUN_IFELSE(
++AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM([[#include <stdlib.h>
+ void __real_exit (int status);
+ void __wrap_exit (int status) { __real_exit (0); }
+--
+GitLab