--- Makefile.in.orig	2020-03-19 08:21:42 UTC
+++ Makefile.in
@@ -462,6 +462,8 @@ DBUS_LIBS=@DBUS_LIBS@
 # defines from autoconf; note that we don't use all of these at present.
 ACDEFS=@DEFS@
 
+CFLAGS_VISIBILITY="-fvisibility=hidden"
+
 CFLAGS=$(CFLAGS_STANDARD) $(GCFLAGS) $(AC_CFLAGS) $(XCFLAGS) @CLUSTER_CFLAGS@
 CFLAGSAUX=$(CFLAGSAUX_STANDARD) $(GCFLAGSAUX) $(XCFLAGSAUX)
 
--- base/lcms2mt.mak.orig	2020-03-19 08:21:42 UTC
+++ base/lcms2mt.mak
@@ -80,7 +80,7 @@ lcms2.config-clean :
 
 # NB: we can't use the normal $(CC_) here because msvccmd.mak
 # adds /Za which conflicts with the lcms source.
-LCMS2_CC=$(CC) $(D_)SHARE_LCMS=$(SHARE_LCMS)$(_D) $(GENOPT) $(CAPOPT) $(CFLAGS) $(LCMS2_CFLAGS) $(I_)$(LCMS2MTSRCDIR)$(D)include $(LCMS2CF_)
+LCMS2_CC=$(CC) $(CFLAGS_VISIBILITY) $(D_)SHARE_LCMS=$(SHARE_LCMS)$(_D) $(GENOPT) $(CAPOPT) $(CFLAGS) $(LCMS2_CFLAGS) $(I_)$(LCMS2MTSRCDIR)$(D)include $(LCMS2CF_)
 LCMS2O_=$(O_)$(LCMS2OBJ)
 
 # switch in the version of lcms2mt.dev we're actually using