diff -up EMBOSS-6.4.0/configure.in.system-zlib EMBOSS-6.4.0/configure.in

--- EMBOSS-6.4.0/configure.in.system-zlib	2011-11-23 17:07:55.000000000 +0100

+++ EMBOSS-6.4.0/configure.in	2011-11-23 17:08:36.848586027 +0100

@@ -644,6 +644,7 @@ if test "${enable_systemlibs}" = "yes" ;

   have_systemlibs=yes

   AC_CHECK_LIB(pcre, pcre_compile)

   AC_CHECK_LIB(expat, XML_ParserCreate)

+  AC_CHECK_LIB(z, compress)

 fi

 AM_CONDITIONAL([ESYSTEMLIBS], [test "$have_systemlibs" = "yes"])

 AC_SUBST([ESYSTEMLIBS])

@@ -808,7 +809,6 @@ AC_CONFIG_FILES([Makefile

                  ajax/core/Makefile

                  ajax/ensembl/Makefile

                  ajax/graphics/Makefile

-                 ajax/zlib/Makefile

                  doc/Makefile

                  doc/manuals/Makefile

                  doc/programs/Makefile

diff -up EMBOSS-6.4.0/configure.system-zlib EMBOSS-6.4.0/configure