patch 7.4.1872
Problem:    Still build problem with old version of Perl.
Solution:   Also define SvREFCNT_inc_void_NN if needed. (Ken Takata)
diff --git a/src/if_perl.xs b/src/if_perl.xs
index 83f1479..89aa2db 100644
--- a/src/if_perl.xs
+++ b/src/if_perl.xs
@@ -71,6 +71,9 @@
 #  define PERLIO_FUNCS_CAST(funcs) (funcs)
 # endif
 #endif
+#ifndef SvREFCNT_inc_void_NN
+# define SvREFCNT_inc_void_NN SvREFCNT_inc
+#endif
 
 /*
  * Work around clashes between Perl and Vim namespace.	proto.h doesn't
diff --git a/src/version.c b/src/version.c
index 3340537..b87300a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -754,6 +754,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1872,
+/**/
     1871,
 /**/
     1870,