--- work/CMakeLists.txt.orig	2017-01-23 10:33:46.000000000 -0600
+++ work/CMakeLists.txt	2018-04-11 19:37:19.197363100 -0500
@@ -80,7 +80,7 @@
 
 # external packages
 FIND_PACKAGE( BZip2 )
-FIND_PACKAGE( ZLIB )
+FIND_PACKAGE( ZLIB NO_SYSTEM_ENVIRONMENT_PATH )
 FIND_PACKAGE( Readline )
 FIND_PACKAGE( Editline )