diff -r b906f6b98e1c ext/filter/config.m4
--- a/ext/filter/config.m4	Tue Dec 11 19:35:51 2018 +0000
+++ b/ext/filter/config.m4	Tue Dec 11 19:37:23 2018 +0000
@@ -9,10 +9,7 @@
 if test "$PHP_FILTER" != "no"; then
 
   dnl Check if configure is the PHP core configure
-  if test -n "$PHP_VERSION"; then
-    dnl This extension can not be build as shared when in PHP core
-    ext_shared=no
-  else
+  if test -z "$PHP_VERSION"; then
     dnl This is PECL build, check if bundled PCRE library is used
     old_CPPFLAGS=$CPPFLAGS
     CPPFLAGS=$INCLUDES