diff --git a/common.mk b/common.mk
index 04061ab513..f2261bf3bb 100644
--- a/common.mk
+++ b/common.mk
@@ -193,6 +193,7 @@ main: $(SHOWFLAGS) exts $(ENCSTATIC:static=lib)encs
 exts enc trans: $(SHOWFLAGS)
 showflags:
 	$(MESSAGE_BEGIN) \
+	"	BASERUBY = `$(BASERUBY) -v`" \
 	"	CC = $(CC)" \
 	"	LD = $(LD)" \
 	"	LDSHARED = $(LDSHARED)" \