$NetBSD$
BSDs don't support long options
--- lib/cpp/Makefile.orig	2016-08-29 21:50:11.282837830 +0000
+++ lib/cpp/Makefile	2016-08-29 21:50:41.337564781 +0000
@@ -10,7 +10,7 @@
 
 install : all
 	$(INSTALL) -d ${DESTDIR}$(prefix)/lib${LIB_SUFFIX}/
-	$(INSTALL) -s --strip-program=${CROSS_COMPILE}${STRIP} libmosquittopp.so.${SOVERSION} ${DESTDIR}${prefix}/lib${LIB_SUFFIX}/libmosquittopp.so.${SOVERSION}
+	$(INSTALL) -s libmosquittopp.so.${SOVERSION} ${DESTDIR}${prefix}/lib${LIB_SUFFIX}/libmosquittopp.so.${SOVERSION}
 	ln -sf libmosquittopp.so.${SOVERSION} ${DESTDIR}${prefix}/lib${LIB_SUFFIX}/libmosquittopp.so
 	$(INSTALL) -d ${DESTDIR}${prefix}/include/
 	$(INSTALL) mosquittopp.h ${DESTDIR}${prefix}/include/mosquittopp.h
