--- a/base/lib.mak
+++ b/base/lib.mak
@@ -610,7 +610,9 @@ surfx_h=$(SURFX_H)
 sstring_h=$(GLSRC)sstring.h
 strimpl_h=$(GLSRC)strimpl.h
 szlibx_h=$(GLSRC)szlibx.h
+ifneq ($(SHARE_ZLIB),1)
 zlib_h=$(ZSRCDIR)$(D)zlib.h
+endif
 # We have two of the following, for shared zlib (_1)
 # and 'local' zlib (_0)
 szlibxx_h_1=$(GLSRC)szlibxx.h $(szlibx_h)