diff --git a/vars/build.vars b/vars/build.vars
index a11a7f7..9c60919 100644
--- a/vars/build.vars
+++ b/vars/build.vars
@@ -560,16 +560,11 @@ HOST_TOOLCHAIN_MINGW32_TARGET="x86_64-w64-mingw32";
 #
 # Build group native_tools
 #
-
-NATIVE_TOOLS_CFLAGS_CONFIGURE="${DEFAULT_CFLAGS:+${DEFAULT_CFLAGS} }--sysroot=${PREFIX_NATIVE}";
-NATIVE_TOOLS_CONFIG_CACHE_LOCAL="${CONFIG_CACHE_GNULIB}";
 NATIVE_TOOLS_CONFIGURE_ARGS="--disable-nls --host=${DEFAULT_TARGET} --program-prefix= --prefix=/ --target=${DEFAULT_TARGET}";
-NATIVE_TOOLS_LDFLAGS_CONFIGURE="--sysroot=${PREFIX_NATIVE}";
 NATIVE_TOOLS_MAKEFLAGS_INSTALL="PREFIX= prefix=";
 NATIVE_TOOLS_PACKAGES="
 mdso perk pkgconf slibtool";
 NATIVE_TOOLS_PREFIX="${PREFIX_NATIVE}";
-NATIVE_TOOLS_PYTHON="${PREFIX}/bin/python2";
 : ${PKG_MDSO_URLS_GIT:="mdso=${DEFAULT_GITROOT}/mdso"};
 : ${PKG_MDSO_CONFIGURE_ARGS:="--prefix= --target=${DEFAULT_TARGET}"};
 : ${PKG_MDSO_INSTALL_FILES:="@mdso=bin/${DEFAULT_TARGET}-mdso /=${DEFAULT_TARGET}/bin @../../bin/mdso=${DEFAULT_TARGET}/bin/mdso"};
@@ -589,10 +584,7 @@ NATIVE_TOOLS_PYTHON="${PREFIX}/bin/python2";
 #
 # Build group native_toolchain
 #
-NATIVE_TOOLCHAIN_CFLAGS_CONFIGURE="${DEFAULT_CFLAGS:+${DEFAULT_CFLAGS} }--sysroot=${PREFIX_NATIVE}";
-NATIVE_TOOLCHAIN_CONFIG_CACHE_LOCAL="${CONFIG_CACHE_GNULIB}";
 NATIVE_TOOLCHAIN_CONFIGURE_ARGS="--disable-nls --host=${DEFAULT_TARGET} --program-prefix= --prefix=/ --target=${DEFAULT_TARGET}";
-NATIVE_TOOLCHAIN_LDFLAGS_CONFIGURE="--sysroot=${PREFIX_NATIVE}";
 NATIVE_TOOLCHAIN_MAKEFLAGS_INSTALL="PREFIX= prefix=";
 NATIVE_TOOLCHAIN_PACKAGES="
 binutils bzip2 expat gcc_full gdb gmp libelf libreadline libz mpc mpfr