Index: libcfa/src/Makefile.am
===================================================================
--- libcfa/src/Makefile.am	(revision 4bb5d36c9f2ab73665ea3f1cdfc6cebfb5f86823)
+++ libcfa/src/Makefile.am	(revision 9939dc312f9fd40e9451c8c3c70ac5e68e233d16)
@@ -33,5 +33,5 @@
 # The built sources must not depend on the installed inst_headers_src
 AM_CFAFLAGS = -quiet -cfalib -I$(srcdir)/stdhdr -I$(srcdir)/concurrency $(if $(findstring ${gdbwaittarget}, ${@}), -XCFA --gdb) @CONFIG_CFAFLAGS@
-AM_CFLAGS = -g -Wall -Werror=return-type -Wno-unused-function -fPIC -fexceptions -pthread @ARCH_FLAGS@ @CONFIG_CFLAGS@
+AM_CFLAGS = -g -Wall -Werror=return-type -Wno-unused-function -fPIC -fexceptions -fvisibility=hidden -pthread @ARCH_FLAGS@ @CONFIG_CFLAGS@
 AM_CCASFLAGS = -g -Wall -Werror=return-type -Wno-unused-function @ARCH_FLAGS@ @CONFIG_CFLAGS@
 CFACC = @CFACC@
@@ -194,9 +194,9 @@
 
 prelude.o : prelude.cfa extras.cf gcc-builtins.cf builtins.cf @LOCAL_CFACC@ @CFACPP@
-	${AM_V_GEN}$(CFACOMPILE) -quiet -XCFA,-l ${<} -c -o ${@}
+	${AM_V_GEN}$(CFACOMPILE) -quiet -XCFA,-l ${<} -c -fvisibility=default -o ${@}
 
 prelude.lo: prelude.cfa extras.cf gcc-builtins.cf builtins.cf @LOCAL_CFACC@ @CFACPP@
 	${AM_V_GEN}$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile \
-	$(CFACOMPILE) -quiet -XCFA,-l ${<} -c -o ${@}
+	$(CFACOMPILE) -quiet -XCFA,-l ${<} -c -fvisibility=default -o ${@}
 
 concurrency/io/call.cfa: $(srcdir)/concurrency/io/call.cfa.in