diff --git a/vars/build.vars b/vars/build.vars
index caa232a..7e2300a 100644
--- a/vars/build.vars
+++ b/vars/build.vars
@@ -380,7 +380,7 @@ HOST_PACKAGES_DEPS_PREFIX="${PREFIX}";
 : ${PKG_PYTHON3_HOST_SHA256SUM:=687e067d9f391da645423c7eda8205bae9d35edc0c76ef5218dcbe4cc770d0d7};
 : ${PKG_PYTHON3_HOST_VERSION:=3.5.1};
 : ${PKG_PYTHON3_HOST_URL:=https://www.python.org/ftp/python/${PKG_PYTHON3_HOST_VERSION}/Python-${PKG_PYTHON3_HOST_VERSION}.tgz};
-: ${PKG_PYTHON3_HOST_CONFIGURE_ARGS_EXTRA:="--enable-ipv6 --enable-shared --without-ensurepip --with-system-expat"};
+: ${PKG_PYTHON3_HOST_CONFIGURE_ARGS_EXTRA:="--enable-ipv6 --enable-shared --with-system-expat --with-system-ffi --without-ensurepip"};
 : ${PKG_PYTHON3_HOST_SUBDIR:=Python-${PKG_PYTHON3_HOST_VERSION}};
 : ${PKG_RUBY_HOST_SHA256SUM:=ba5ba60e5f1aa21b4ef8e9bf35b9ddb57286cb546aac4b5a28c71f459467e507};
 : ${PKG_RUBY_HOST_VERSION:=2.3.0};
@@ -1061,7 +1061,7 @@ patch patchutils perl python2 python3 ruby smallbasic tcl";
 : ${PKG_PYTHON3_SHA256SUM:=687e067d9f391da645423c7eda8205bae9d35edc0c76ef5218dcbe4cc770d0d7};
 : ${PKG_PYTHON3_VERSION:=3.5.1};
 : ${PKG_PYTHON3_URL:=https://www.python.org/ftp/python/${PKG_PYTHON3_VERSION}/Python-${PKG_PYTHON3_VERSION}.tgz};
-: ${PKG_PYTHON3_CONFIGURE_ARGS:="--build=x86_64 -C --enable-ipv6 --enable-shared --host=${DEFAULT_TARGET} --prefix=${PREFIX_NATIVE} --without-ensurepip"};
+: ${PKG_PYTHON3_CONFIGURE_ARGS:="--build=x86_64 -C --enable-ipv6 --enable-shared --host=${DEFAULT_TARGET} --prefix=${PREFIX_NATIVE} --with-system-expat --with-system-ffi --without-ensurepip"};
 : ${PKG_PYTHON3_ENV_VARS_EXTRA:="BLDSHARED=${DEFAULT_TARGET}-gcc -shared -mout-dsolib --sysroot=${PREFIX_NATIVE}:CC=${DEFAULT_TARGET}-gcc:CFLAGS=--sysroot=${PREFIX_NATIVE}:CPPFLAGS=--sysroot=${PREFIX_NATIVE}:LDFLAGS=-L${PREFIX_NATIVE}/lib"}:
 : ${PKG_PYTHON3_INSTALL_FILES:="@python3=bin/python"};
 : ${PKG_PYTHON3_SUBDIR:=Python-${PKG_PYTHON3_VERSION}};
diff --git a/vars/python3.vars b/vars/python3.vars
index b193fa5..3c3fb58 100644
--- a/vars/python3.vars
+++ b/vars/python3.vars
@@ -12,6 +12,7 @@ pkg_python3_configure_pre() {
 		PGEN=Parser/hostpgen Parser/hostpgen;
 	make distclean);
 	ex_rtl_fileop mv "../${PKG_SUBDIR}/config.cache" .;
+	ex_rtl_fileop rm "../${PKG_SUBDIR}/Modules/zlib";
 };
 
 # vim:filetype=sh
diff --git a/vars/python3_host.vars b/vars/python3_host.vars
index 8f4817c..51705fb 100644
--- a/vars/python3_host.vars
+++ b/vars/python3_host.vars
@@ -2,6 +2,10 @@
 # set -o errexit -o noglob are assumed.
 #
 
+pkg_python3_host_configure_pre() {
+	ex_rtl_fileop rm "${PKG_SUBDIR}/Modules/zlib";
+};
+
 pkg_python3_host_install_make_post() {
 	if ex_rtl_fileop test "${PKG_DESTDIR}/bin/python3"; then
 		ex_rtl_fileop rm "${PKG_DESTDIR}/bin/python3";