diff --git a/glpk-4.53-unbundle-zlib.diff b/glpk-4.53-unbundle-zlib.diff
new file mode 100644
index 0000000..f4684de
--- /dev/null
+++ b/glpk-4.53-unbundle-zlib.diff
@@ -0,0 +1,102 @@
+diff -urN glpk-4.53.orig/doc/glpk11.tex glpk-4.53/doc/glpk11.tex
+--- glpk-4.53.orig/doc/glpk11.tex	2014-02-13 04:00:00.000000000 -0500
++++ glpk-4.53/doc/glpk11.tex	2014-05-29 14:11:17.267644446 -0400
+@@ -154,50 +154,4 @@
+ \noindent
+ \url{http://www.cs.chalmers.se/Cs/Research/FormalMethods/MiniSat}
+ 
+-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+-
+-\section{zlib}
+-
+-\noindent
+-zlib version 1.2.5, Copyright {\copyright} 1995--2010 Jean-loup Gailly
+-and Mark Adler.
+-
+-\para{Description}
+-
+-zlib is a general purpose data compression library. All the code is
+-thread safe. The data format used by the zlib library is described by
+-RFCs (Request for Comments) 1950 to 1952 in the files
+-\verb|rfc1950.txt| (zlib format), \verb|rfc1951.txt| (deflate format)
+-and \verb|rfc1952.txt| (gzip format).
+-
+-\para{License}
+-
+-This software is provided 'as-is', without any express or implied
+-warranty. In no event will the authors be held liable for any damages
+-arising from the use of this software.
+-
+-Permission is granted to anyone to use this software for any purpose,
+-including commercial applications, and to alter it and redistribute it
+-freely, subject to the following restrictions:
+-
+-1. The origin of this software must not be misrepresented; you must not
+-   claim that you wrote the original software. If you use this software
+-   in a product, an acknowledgment in the product documentation would
+-   be appreciated but is not required.
+-
+-2. Altered source versions must be plainly marked as such, and must not
+-   be misrepresented as being the original software.
+-
+-3. This notice may not be removed or altered from any source
+-   distribution.
+-
+-\hfill Jean-loup Gailly
+-
+-\hfill Mark Adler
+-
+-\para{Availability}
+-
+-\noindent
+-\url{http://www.zlib.net/}
+-
+ %* eof *%
+diff -urN glpk-4.53.orig/src/Makefile.am glpk-4.53/src/Makefile.am
+--- glpk-4.53.orig/src/Makefile.am	2014-02-13 04:00:00.000000000 -0500
++++ glpk-4.53/src/Makefile.am	2014-05-29 14:10:00.882564303 -0400
+@@ -13,8 +13,7 @@
+ -I$(srcdir)/env \
+ -I$(srcdir)/minisat \
+ -I$(srcdir)/misc \
+--I$(srcdir)/proxy \
+--I$(srcdir)/zlib
++-I$(srcdir)/proxy
+ 
+ libglpk_la_LDFLAGS = \
+ -version-info 37:0:1 \
+@@ -147,21 +146,6 @@
+ misc/wclique.c \
+ misc/wclique1.c \
+ proxy/proxy.c \
+-proxy/proxy1.c \
+-zlib/adler32.c \
+-zlib/compress.c \
+-zlib/crc32.c \
+-zlib/deflate.c \
+-zlib/gzclose.c \
+-zlib/gzlib.c \
+-zlib/gzread.c \
+-zlib/gzwrite.c \
+-zlib/inffast.c \
+-zlib/inflate.c \
+-zlib/inftrees.c \
+-zlib/trees.c \
+-zlib/uncompr.c \
+-zlib/zio.c \
+-zlib/zutil.c
++proxy/proxy1.c
+ 
+ ## eof ##
+diff -urN glpk-4.53.orig/examples/Makefile.am glpk-4.53/examples/Makefile.am
+--- glpk-4.53.orig/examples/Makefile.am	2014-02-13 04:00:00.000000000 -0500
++++ glpk-4.53/examples/Makefile.am	2014-05-29 14:29:09.113874836 -0400
+@@ -2,7 +2,7 @@
+ 
+ AM_CPPFLAGS = -I$(srcdir)/../src
+ 
+-LDADD = ../src/libglpk.la
++LDADD = ../src/libglpk.la -lz
+ 
+ bin_PROGRAMS = glpsol
+ 
diff --git a/glpk.spec b/glpk.spec
index 231446b..cf3ecc9 100644
--- a/glpk.spec
+++ b/glpk.spec
@@ -1,14 +1,19 @@
 Name:           glpk
 Version:        4.53
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        GNU Linear Programming Kit
 
 Group:          System Environment/Libraries
 License:        GPLv3
 URL:            http://www.gnu.org/software/glpk/glpk.html
 Source0:        ftp://ftp.gnu.org/gnu/glpk/glpk-%{version}.tar.gz
+# Un-bundle zlib (#1102855). Upstream won't accept; they want to be
+# ANSI-compatible, and zlib makes POSIX assumptions.
+Patch0:         glpk-4.53-unbundle-zlib.diff
 BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 
+BuildRequires:  autoconf
+
 %description
 The GLPK (GNU Linear Programming Kit) package is intended for solving
 large-scale linear programming (LP), mixed integer programming (MIP),
@@ -67,9 +72,15 @@ the GLPK (GNU Linear Programming Kit) libraries.
 
 %prep
 %setup -q
+%patch0 -p1
+rm -rf src/zlib
 
 %build
 export LIBS=-ldl
+
+# Need to rebuild src/Makefile.in from src/Makefile.am
+autoreconf -ifs
+
 %configure
 # Die die die, rpath.
 sed -i -e 's|hardcode_libdir_flag_spec=.*|hardcode_libdir_flag_spec=""|' libtool
@@ -120,7 +131,10 @@ rm -rf $RPM_BUILD_ROOT
 
 
 %changelog
-* Fri Feb 14 2014 Conrad Meyer <cemeyer@uw.edu> - 4.53
+* Thu May 29 2014 Cornad Meyer <cemeyer@uw.edu> - 4.53-2
+- Un-bundle zlib (rh #1102855)
+
+* Fri Feb 14 2014 Conrad Meyer <cemeyer@uw.edu> - 4.53-1
 - Bump to latest upstream 4.53
 - Drop glp_get_it_cnt() patch; now present in glpk.h, glpapi06.c
 - Kill rpath