https://github.com/libunwind/libunwind/pull/315
--- a/configure.ac
+++ b/configure.ac
@@ -136,7 +136,7 @@ AC_MSG_RESULT([$enable_ptrace])
 
 AC_ARG_ENABLE(setjmp,
 	AS_HELP_STRING([--enable-setjmp],[building libunwind-setjmp library]),,
-        [AS_IF([test x$target_arch == x$host_arch], [enable_setjmp=yes], [enable_setjmp=no])]
+        [AS_IF([test x$target_arch = x$host_arch], [enable_setjmp=yes], [enable_setjmp=no])]
 )
 
 AC_ARG_ENABLE(documentation,
@@ -261,7 +261,7 @@ case "${target_arch}" in
   (aarch64) enable_debug_frame=yes;;
   (*)   enable_debug_frame=no;;
 esac])
-if test x$remote_only == xyes; then
+if test x$remote_only = xyes; then
   enable_debug_frame=no
 fi
 if test x$enable_debug_frame = xyes; then
