--- swig/python/Makefile.am
+++ swig/python/Makefile.am
@@ -18,9 +18,9 @@
 _geos_la_SOURCES = geos_wrap.cxx 
 
 # Only need to grab the capi header files
-_geos_la_CPPFLAGS = $(SWIG_PYTHON_CPPFLAGS) -I$(top_builddir)/capi
+_geos_la_CPPFLAGS = $(SWIG_PYTHON_CPPFLAGS) -I$(top_builddir)/capi -shared
 # Specify -module and -avoid-version so we can create a file called geos.dll/so which is what Python wants
-_geos_la_LDFLAGS = -no-undefined -module -avoid-version
+_geos_la_LDFLAGS = -no-undefined -module -avoid-version -shared
 _geos_la_LIBADD = $(top_builddir)/capi/libgeos_c.la $(PYTHON_LDFLAGS)
 
 
--- swig/ruby/Makefile.am
+++ swig/ruby/Makefile.am
@@ -22,10 +22,10 @@
 geos_la_LIBADD =  $(top_builddir)/capi/libgeos_c.la -l$(RUBY_SO_NAME)
 
 # Only need to grab the capi header files
-geos_la_CPPFLAGS = -I$(top_builddir)/capi
+geos_la_CPPFLAGS = -I$(top_builddir)/capi -shared
 
 # Specify -module and -avoid-version so we can create a file called geos.dll/so which is what Ruby wants
-geos_la_LDFLAGS = -no-undefined  -module -avoid-version -L$(RUBY_LIB_DIR)
+geos_la_LDFLAGS = -no-undefined  -module -avoid-version -shared -L$(RUBY_LIB_DIR)
 
 if ENABLE_SWIG