diff --git a/mbedtls-2.4-config-enable-pkcs11.patch b/mbedtls-2.4-config-enable-pkcs11.patch
deleted file mode 100644
index fd31bbc..0000000
--- a/mbedtls-2.4-config-enable-pkcs11.patch
+++ /dev/null
@@ -1,11 +0,0 @@
---- include/mbedtls/config.h.orig	2017-03-29 12:55:55.677132417 +0200
-+++ include/mbedtls/config.h	2017-03-29 12:56:09.476057072 +0200
-@@ -2109,7 +2109,7 @@
-  * This module enables SSL/TLS PKCS #11 smartcard support.
-  * Requires the presence of the PKCS#11 helper library (libpkcs11-helper)
-  */
--//#define MBEDTLS_PKCS11_C
-+#define MBEDTLS_PKCS11_C
- 
- /**
-  * \def MBEDTLS_PKCS12_C
diff --git a/mbedtls-2.7-config-enable-threading-pthread.patch b/mbedtls-2.7-config-enable-threading-pthread.patch
deleted file mode 100644
index f9c02af..0000000
--- a/mbedtls-2.7-config-enable-threading-pthread.patch
+++ /dev/null
@@ -1,20 +0,0 @@
---- include/mbedtls/config.h.orig	2018-02-05 12:36:59.000000000 +0100
-+++ include/mbedtls/config.h	2018-02-06 14:37:48.911218309 +0100
-@@ -1431,7 +1431,7 @@
-  *
-  * Uncomment this to enable pthread mutexes.
-  */
--//#define MBEDTLS_THREADING_PTHREAD
-+#define MBEDTLS_THREADING_PTHREAD
- 
- /**
-  * \def MBEDTLS_VERSION_FEATURES
-@@ -2508,7 +2508,7 @@
-  *
-  * Enable this layer to allow use of mutexes within mbed TLS
-  */
--//#define MBEDTLS_THREADING_C
-+#define MBEDTLS_THREADING_C
- 
- /**
-  * \def MBEDTLS_TIMING_C
diff --git a/mbedtls.spec b/mbedtls.spec
index 3f69e58..ffa89d5 100644
--- a/mbedtls.spec
+++ b/mbedtls.spec
@@ -4,29 +4,23 @@
 
 Name: mbedtls
 Version: 2.14.1
-Release: 1%{?dist}
+Release: 2%{?dist}
 Summary: Light-weight cryptographic and SSL/TLS library
 Group: System Environment/Libraries
 License: ASL 2.0
 URL: https://tls.mbed.org/
 Source0: https://tls.mbed.org/download/%{name}-%{version}-apache.tgz
 
-# mbed TLS way of enabling features
-Patch0: mbedtls-2.4-config-enable-pkcs11.patch
-Patch1: mbedtls-2.7-config-enable-threading-pthread.patch
-
 BuildRequires: gcc-c++
 BuildRequires: cmake
 BuildRequires: perl-interpreter
 BuildRequires: doxygen
 BuildRequires: graphviz
 BuildRequires: pkcs11-helper-devel
+BuildRequires: zlib-devel
 
 Requires: pkcs11-helper
 
-%if 0%{?rhel} == 5
-%endif
-
 # replace polarssl with mbedtls
 
 Obsoletes: polarssl < 1.3.10
@@ -72,33 +66,35 @@ developing applications that use %{name}.
 %package        doc
 Summary:        Documentation files for %{name}
 Group:          Documentation
-%if 0%{?fedora} || 0%{?rhel} >= 6
 BuildArch:      noarch
-%endif
 
 %description    doc
 The %{name}-doc package contains documentation.
 
 %prep
-%setup -q
-%patch0
-%patch1
+%autosetup
 
-%build
-%cmake -D CMAKE_BUILD_TYPE:String="Release" -D USE_SHARED_MBEDTLS_LIBRARY:BOOL=1 -D USE_PKCS11_HELPER_LIBRARY:BOOL=1 .
+sed -i 's|//\(#define MBEDTLS_PKCS11_C\)|\1|' include/mbedtls/config.h
+sed -i 's|//\(#define MBEDTLS_HAVEGE_C\)|\1|' include/mbedtls/config.h
+sed -i 's|//\(#define MBEDTLS_THREADING_C\)|\1|' include/mbedtls/config.h
+sed -i 's|//\(#define MBEDTLS_THREADING_PTHREAD\)|\1|' include/mbedtls/config.h
+sed -i 's|//\(#define MBEDTLS_ZLIB_SUPPORT\)|\1|' include/mbedtls/config.h
 
-%if 0%{?rhel} == 5
-sed -e 's/libmbedtls.so$/libmbedtls.so.%{version}/' -i tests/CMakeFiles/test_suite_*.dir/build.make
-%endif
+%build
+%cmake \
+	-DCMAKE_BUILD_TYPE=Release \
+	-DLINK_WITH_PTHREAD=ON \
+	-DUSE_PKCS11_HELPER_LIBRARY=ON \
+	-DENABLE_ZLIB_SUPPORT=ON \
+	-DINSTALL_MBEDTLS_HEADERS=ON \
+	-DUSE_SHARED_MBEDTLS_LIBRARY=ON \
+	-DUSE_STATIC_MBEDTLS_LIBRARY=ON
 
 make %{?_smp_mflags} all apidoc
 
 %install
-%if 0%{?fedora} || 0%{?rhel} >= 6
 %make_install
-%else
-make DESTDIR=$RPM_BUILD_ROOT install
-%endif
+
 mkdir -p $RPM_BUILD_ROOT%{_libexecdir}
 mv $RPM_BUILD_ROOT%{_bindir} $RPM_BUILD_ROOT%{_libexecdir}/mbedtls
 
@@ -129,6 +125,10 @@ LD_LIBRARY_PATH=$PWD/library ctest --output-on-failure -V
 %doc apidoc/*
 
 %changelog
+* Thu Dec 20 2018 Morten Stevens <mstevens@fedoraproject.org> - 2.14.1-2
+- Spec file improvements
+- Enabled zlib support
+
 * Fri Dec 07 2018 Morten Stevens <mstevens@fedoraproject.org> - 2.14.1-1
 - Update to 2.14.1
 - CVE-2018-19608 (#1656784)