--- build/pkgs/zlib/spkg-install-orig	2014-12-06 21:41:30.000000000 +0000
+++ build/pkgs/zlib/spkg-install	2014-12-06 21:42:12.000000000 +0000
@@ -1,5 +1,9 @@
 #!/usr/bin/env bash
 
+# Use system zlibc because on FreeBSD the following doesn't build relocatable
+# libraries.
+exit 0
+
 if [ -z "$SAGE_LOCAL" ]; then
     echo >&2 "Error: SAGE_LOCAL undefined - exiting..."
     echo >&2 "Maybe run 'sage -sh'?"