Update m4/pdns_check_dnstap.m4

Co-authored-by: Remi Gacogne <rgacogne+github@valombre.net>

diff --git a/m4/pdns_check_dnstap.m4 b/m4/pdns_check_dnstap.m4
index 651eaccf670731b6e3f8b400c3e2fab5c2961cc6..cd6dc49f469568aa48d871920a2c2d56b6cba3b0 100644 (file)
--- a/m4/pdns_check_dnstap.m4
+++ b/m4/pdns_check_dnstap.m4
@@ -28,7 +28,7 @@ AC_DEFUN([PDNS_CHECK_DNSTAP], [
     AS_IF([test x"$FSTRM_LIBS" = "x"], [
       AC_MSG_ERROR([dnstap requested but libfstrm was not found])
     ])
-    AS_IF([test "x$PROTOBUF_LIBS" = "x" -a x"$PROTOC" = "x"], [
+    AS_IF([test "x$PROTOBUF_LIBS" = "x" -o x"$PROTOC" = "x"], [
       AC_MSG_ERROR([dnstap requested but protobuf was not found])
     ])
   ])