--- GNUmakefile.in
+++ GNUmakefile.in
@@ -43,7 +43,10 @@
 # - the name of the game.
 #
 libfactory =	@libfactory@
-
+libfactory_so 		= $(libfactory:.a=.so)
+libfactory_sover	= $(libfactory_so).@factory_version@
+libcfmem_so			= libcfmem.so
+libcfmem_sover		= libcfmem.so.$(version)
 #
 # - programs.
 #
@@ -51,7 +54,7 @@
 CXX =		@CXX@
 # seems configure sometimes finds non-BSD install, so we better
 # hardcode path to our install-sh
-INSTALL =	$(srcdir)/bin/install-sh -c
+INSTALL =	@INSTALL@
 INSTALL_DATA =	@INSTALL_DATA@
 INSTALL_PROGRAM=@INSTALL_PROGRAM@
 RANLIB =	@RANLIB@
@@ -200,8 +203,8 @@
 # factory object files and dependencies
 factoryobj1 :=  $(factorysrc:%.cc=%.o)
 factoryobj :=   $(factoryobj1:%.y=%.o)
-factorygobj :=  $(factorysrc:%.cc=%.og)
-factorypobj :=  $(factorysrc:%.cc=%.op)
+factoryobj1 :=  $(factorysrc:%.cc=%.o_pic)
+factoryobj_pic := $(factoryobj1:%.y=%.o_pic)
 factorydep :=	$(factorysrc:%.cc=%.d)
 factorydep :=	$(factorydep:%.y=%.d)
 
@@ -295,6 +298,8 @@
 # memory manager object files and dependencies
 memmanobj :=	$(memmansrc:.cc=.o)
 memmanobj :=	$(memmanobj:.c=.o)
+memmanobj_pic :=	$(memmansrc:.cc=.o_pic)
+memmanobj_pic :=	$(memmanobj_pic:.c=.o_pic)
 memmandep :=	$(memmansrc:.cc=.d)
 memmandep :=	$(memmandep:.c=.d)
 
@@ -426,16 +431,14 @@
 #
 
 # how to create library objets
-%.o: %.cc config.h
+%.o: %.cc config.h factoryconf.h
 	$(CXX) -c $< $(LIBCXXFLAGS) -o $@
-%.o: %.c config.h
+%.o: %.c config.h factoryconf.h
 	$(CC) -c $< $(LIBCFLAGS) -o $@
-# the debug version:
-%.og: %.cc config.h
-	$(CXX) -g -c $< $(LIBCGGFLAGS) -o $@
-# the profiling version:
-%.op: %.cc config.h
-	$(CXX) -O -pg -c $< $(LIBCGGFLAGS) -o $@
+%.o_pic: %.cc config.h factoryconf.h
+	$(CXX) -c $< $(LIBCXXFLAGS) -fPIC -o $@
+%.o_pic: %.c config.h factoryconf.h
+	$(CC) -c $< $(LIBCFLAGS) -fPIC -o $@
 
 # how to create dependency files.  To avoid broken dependency files
 # (which in turn break this GNUmakefile) we first generate them in
@@ -463,9 +466,9 @@
 #
 all:		$(alltargets)
 
-cf:		factoryconf.h factory.h $(libfactory) libsingcf_g.a
+cf:		factoryconf.h factory.h $(libfactory) $(libfactory_sover)
 
-mem:		libcfmem.a
+mem:		libcfmem.a $(libcfmem_sover)
 
 #
 # - explicit targets.
@@ -474,18 +477,16 @@
 		$(AR) $(ARFLAGS) $@ $^
 		$(RANLIB) $@
 
-libsingcf_g.a:	$(factorygobj)
-		$(AR) $(ARFLAGS) $@ $^
-		$(RANLIB) $@
-
-libsingcf_p.a:	$(factorypobj)
-		$(AR) $(ARFLAGS) $@ $^
-		$(RANLIB) $@
+$(libfactory_sover): $(factoryobj_pic)
+		$(CXX) -shared -Wl,-soname,$(libfactory_so).3 $(LDFLAGS) -o $@ $^ $(LIBS)
 
 libcfmem.a:	$(memmanobj)
 		$(AR) $(ARFLAGS) $@ $^
 		$(RANLIB) $@
 
+$(libcfmem_sover): $(memmanobj_pic)
+		$(CXX) -shared -Wl,-soname,$(libcfmem_so).3 $(LDFLAGS) -o $@ $^ $(LIBS)
+
 ftmpl_inst.o:	ftmpl_inst.cc factoryconf.h factory.h \
 		$(addprefix templates/,$(templatesrc)) \
 		$(addprefix templates/,$(templateincl))
@@ -605,45 +606,41 @@
 #
 install:	$(installtargets)
 
-install_all:	install libsingcf_p.a
-		-$(INSTALL_DATA) libsingcf_p.a $(libdir)/libsingcf_p.a
-
 install-nolns: install
 
 installcf:	cf
-		$(MKINSTALLDIRS) $(libdir)
-		$(MKINSTALLDIRS) $(includedir)
-		$(MKINSTALLDIRS) $(templatedir)
-		$(INSTALL_DATA) $(libfactory) $(libdir)/$(libfactory)
-		-$(INSTALL_DATA) libsingcf_g.a $(libdir)/libsingcf_g.a
-		$(INSTALL_DATA) factory.h $(includedir)/factory.h
-		$(INSTALL_DATA) cf_gmp.h $(includedir)/cf_gmp.h
-		$(INSTALL_DATA) factoryconf.h $(includedir)/factoryconf.h
-		$(INSTALL_DATA) $(srcdir)/ftmpl_inst.cc $(templatedir)/ftmpl_inst.cc
+		$(INSTALL_DATA) -D $(libfactory) $(DESTDIR)$(libdir)/$(libfactory)
+		$(INSTALL_PROGRAM) -D $(libfactory_sover) $(DESTDIR)$(libdir)/$(libfactory_sover)
+		$(LN_S) $(libfactory_sover) $(DESTDIR)$(libdir)/$(libfactory_so).3
+		$(LN_S) $(libfactory_sover) $(DESTDIR)$(libdir)/$(libfactory_so)
+		$(INSTALL_DATA) -D factory.h $(DESTDIR)$(includedir)/factory.h
+		$(INSTALL_DATA) cf_gmp.h $(DESTDIR)$(includedir)/cf_gmp.h
+		$(INSTALL_DATA) factoryconf.h $(DESTDIR)$(includedir)/factoryconf.h
+		$(INSTALL_DATA) -D $(srcdir)/ftmpl_inst.cc $(DESTDIR)$(templatedir)/ftmpl_inst.cc
 		for file in $(templatesrc) $(templateincl); do \
-		  $(INSTALL_DATA) $(srcdir)/templates/$$file $(templatedir)/$$file; \
+		  $(INSTALL_DATA) $(srcdir)/templates/$$file $(DESTDIR)$(templatedir)/$$file; \
 		done
 # we run `ranlib' another time for SUN machines
-		$(RANLIB) $(libdir)/$(libfactory)
+		$(RANLIB) $(DESTDIR)$(libdir)/$(libfactory)
 
 installmem:	mem
-		$(MKINSTALLDIRS) $(libdir)
-		$(INSTALL_DATA) libcfmem.a $(libdir)/libcfmem.a
+		$(INSTALL_DATA) -D libcfmem.a $(DESTDIR)$(libdir)/libcfmem.a
+		$(INSTALL_PROGRAM) $(libcfmem_sover) $(DESTDIR)$(libdir)/$(libcfmem_sover)
+		$(LN_S) $(libcfmem_sover) $(DESTDIR)$(libdir)/$(libcfmem_so).3
+		$(LN_S) $(libcfmem_sover) $(DESTDIR)$(libdir)/$(libcfmem_so)
 # once again: another run for SUN
-		$(RANLIB) $(libdir)/libcfmem.a
+		$(RANLIB) $(DESTDIR)$(libdir)/libcfmem.a
 
 # to a pity, this cannot be done automatically ...
 installgftables:
 		@echo "Copying GF(q) tables ..."
 		@if test -d gftables; then \
-		  $(MKINSTALLDIRS) $(gftabledir); \
 		  for file in gftables/gftable.*.*; do \
-		    $(INSTALL_DATA) $$file $(gftabledir); \
+		    $(INSTALL_DATA) -D $$file $(DESTDIR)$(gftabledir); \
 		  done \
 		elif test -d "$(srcdir)"/gftables; then \
-		  $(MKINSTALLDIRS) $(gftabledir); \
 		  for file in "$(srcdir)"/gftables/gftable.*.*; do \
-		    $(INSTALL_DATA) $$file $(gftabledir); \
+		    $(INSTALL_DATA) -D $$file $(DESTDIR)$(gftabledir); \
 		  done \
 		else \
 		  echo "Run 'make gftables' before installing them"; \