Index: Makefile.in
==================================================================
--- Makefile.in
+++ Makefile.in
@@ -22,10 +22,12 @@
 	mv @TCLEXT_BUILD@-@EXTENSION_TARGET@ @EXTENSION_TARGET@
 
 # The shared object target
 shared-@EXTENSION_TARGET@: tls.o tlsBIO.o tlsIO.o tlsX509.o Makefile
 	$(CC) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -o shared-@EXTENSION_TARGET@ tls.o tlsBIO.o tlsIO.o tlsX509.o $(LIBS)
+	-@WEAKENSYMS@ shared-@EXTENSION_TARGET@
+	-@REMOVESYMS@ shared-@EXTENSION_TARGET@
 
 # The static target
 static-@EXTENSION_TARGET@: tls.o tlsBIO.o tlsIO.o tlsX509.o Makefile
 	$(AR) rcu static-@EXTENSION_TARGET@ tls.o tlsBIO.o tlsIO.o tlsX509.o
 	-$(RANLIB) static-@EXTENSION_TARGET@

Index: aclocal/tcltls_openssl.m4
==================================================================
--- aclocal/tcltls_openssl.m4
+++ aclocal/tcltls_openssl.m4
@@ -117,12 +117,12 @@
 	fi
 	PKG_CONFIG_PATH="${PKG_CONFIG_PATH_SAVE}"
 
 	if test "$TCLEXT_BUILD" = "static"; then
 		dnl If we are doing a static build, save the linker flags for other programs to consume
-		rm -f tcltls.a.linkadd
-		AS_ECHO(["$TCLTLS_SSL_LIBS"]) > tcltls.a.linkadd
+		rm -f tcltls.${AREXT}.linkadd
+		AS_ECHO(["$TCLTLS_SSL_LIBS"]) > tcltls.${AREXT}.linkadd
 	fi
 
 	dnl If we have been asked to statically link to the SSL library, specifically tell the linker to do so
 	if test "$TCLEXT_TLS_STATIC_SSL" = 'yes'; then
 		dnl Don't bother doing this if we aren't actually doing the runtime linking

Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -242,8 +242,15 @@
 		DC_SYNC_RPATH([no])
 	else
 		DC_SYNC_RPATH([yes])
 	fi
 fi
+
+dnl Enable a stable ABI
+DC_SETUP_STABLE_API([${srcdir}/tcltls.vers], tcltls.syms)
+if test "$tcltls_debug" = 'true'; then
+	WEAKENSYMS=':'
+	REMOVESYMS=':'
+fi
 
 dnl Produce output
-AC_OUTPUT(Makefile pkgIndex.tcl)
+AC_OUTPUT(Makefile pkgIndex.tcl tcltls.syms)

ADDED   tcltls.syms.in
Index: tcltls.syms.in
==================================================================
--- /dev/null
+++ tcltls.syms.in
@@ -0,0 +1,1 @@
+@SYMPREFIX@Tls_Init

ADDED   tcltls.vers
Index: tcltls.vers
==================================================================
--- /dev/null
+++ tcltls.vers
@@ -0,0 +1,6 @@
+{
+	global:
+		Tls_Init;
+	local:
+		*;
+};