This fixes build with sys-devel/slibtool

--- cppunit-1.15.1/src/cppunit/Makefile.am
+++ cppunit-1.15.1/src/cppunit/Makefile.am
@@ -62,6 +62,6 @@
 
 libcppunit_la_LDFLAGS= \
  -no-undefined -version-info $(LT_CURRENT):$(LT_REVISION):$(LT_AGE) \
- -release $(LT_RELEASE) $(LIBADD_DL)
+ $(LIBADD_DL)
 
 libcppunit_la_LIBADD = $(LIBADD_DL)