diff --git a/vars/build.vars b/vars/build.vars
index 5e6a16e..782839f 100644
--- a/vars/build.vars
+++ b/vars/build.vars
@@ -403,10 +403,8 @@ NATIVE_TOOLCHAIN_DEPS_PREFIX="${PREFIX_NATIVE}";
 : ${PKG_LIBZ_SHA256SUM:=abcc2831b7a0e891d0875fa852e9b9510b420d843d3d20aad010f65493fe4f7b};
 : ${PKG_LIBZ_VERSION:=1.2.8.2015.12.26};
 : ${PKG_LIBZ_URL:=https://sortix.org/libz/release/libz-${PKG_LIBZ_VERSION}.tar.gz};
-: ${PKG_LIBZ_CFLAGS_CONFIGURE:="${DEFAULT_CFLAGS:+${DEFAULT_CFLAGS} }--sysroot=${PREFIX_NATIVE}"};
 : ${PKG_LIBZ_CONFIG_CACHE_LOCAL:="${CONFIG_CACHE_GNULIB}"};
 : ${PKG_LIBZ_CONFIGURE_ARGS:="--host=${DEFAULT_TARGET} --prefix= --target=${DEFAULT_TARGET} --enable-shared"};
-: ${PKG_LIBZ_LDFLAGS_CONFIGURE:="${DEFAULT_LDFLAGS:+${DEFAULT_LDFLAGS} }--sysroot=${PREFIX_NATIVE}"};
 : ${PKG_LIBZ_MAKEFLAGS_INSTALL:="PREFIX= prefix="};
 : ${PKG_MPFR_SHA256SUM:=79c73f60af010a30a5c27a955a1d2d01ba095b72537dab0ecaad57f5a7bb1b6b};
 : ${PKG_MPFR_VERSION:=3.1.2};