Index: ext/tinydtls/Makefile.in
--- ext/tinydtls/Makefile.in.orig
+++ ext/tinydtls/Makefile.in
@@ -31,8 +31,8 @@ exec_prefix = @exec_prefix@
 abs_builddir = @abs_builddir@
 top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
-libdir = @libdir@
-includedir = @includedir@/@PACKAGE_NAME@
+libdir = $(PREFIX)/lib
+includedir = $(PREFIX)/include/@PACKAGE_NAME@
 package = @PACKAGE_TARNAME@-@PACKAGE_VERSION@
 
 install := cp
@@ -52,7 +52,7 @@ DISTDIR=$(top_builddir)/$(package)
 FILES:=Makefile.in configure configure.ac dtls_config.h.in \
   Makefile.tinydtls $(SOURCES) $(HEADERS)
 LIB:=libtinydtls
-LIBS:=$(LIB).a $(LIB).so
+LIBS:=$(LIB).a $(LIB).so.${LIBtinydtls_VERSION}
 LDFLAGS:=@LIBS@
 ARFLAGS:=cru
 doc:=doc
@@ -81,7 +81,7 @@ dirs:	$(SUBDIRS)
 $(SUB_OBJECTS)::
 	$(MAKE) -C $(@D) $(@F)
 
-$(LIB).so: $(OBJECTS)
+$(LIB).so.${LIBtinydtls_VERSION}: $(OBJECTS)
 	$(LINK.c) $(LDFLAGS) -shared $^ -o $@
 
 $(LIB).a: $(OBJECTS)