diff --git a/vars/build.vars b/vars/build.vars
index d39a972..bb3fef5 100644
--- a/vars/build.vars
+++ b/vars/build.vars
@@ -172,12 +172,13 @@ HOST_DEPS_MAKEFLAGS_INSTALL="prefix= PREFIX=";
 HOST_DEPS_PACKAGES="
 autoconf_host automake_host bison_host bmake_host bzip2_host
 chainport_host clang_host clzip_host cmake_host dbus_glib_host dbus_host
-expat_host file_host gdb_host gdbm_host gettext_tiny_host glib_host
-gperf_host infounzip_host infozip_host install_strip_host intltool_host
-libffi_host libreadline_host libressl_host libtool_host libz_host
-libzip_host llvm_host m4_host mdso_host mpackage_host musl_fts_host
-ncurses_host ncursestw_host ncursesw_host pcre_host perk_host python2_host
-python3_host ruby_host sqlite3_host texinfo_host tzdb_host xz_host";
+expat_host file_host flex_host gdb_host gdbm_host gettext_tiny_host
+glib_host gperf_host infounzip_host infozip_host install_strip_host
+intltool_host libffi_host libreadline_host libressl_host libtool_host
+libz_host libzip_host llvm_host m4_host mdso_host mpackage_host
+musl_fts_host ncurses_host ncursestw_host ncursesw_host pcre_host
+perk_host python2_host python3_host ruby_host sqlite3_host texinfo_host
+tzdb_host xz_host";
 HOST_DEPS_PREFIX="${PREFIX}";
 : ${PKG_AUTOCONF_HOST_DEPENDS:="m4_host"};
 : ${PKG_AUTOCONF_HOST_SHA256SUM:=64ebcec9f8ac5b2487125a86a7760d2591ac9e1d3dbd59489633f9de62a57684};