diff --git a/vars/build.vars b/vars/build.vars
index a20e79b..4a93d9d 100644
--- a/vars/build.vars
+++ b/vars/build.vars
@@ -480,7 +480,7 @@ libevent libfetch libogg libvorbis libflac libtheora libsasl2 libshine libsndfil
 libgpg_error libassuan libfirm libgcrypt libksba libudns lua ncurses
 ncursestw ncursesw libreadline libxslt libtirpc npth popt file xz zstd
 rpm libsolv tdnf shared_mime_info sqlite3 w32api w32lib libuv cmake
-qrencode tcl util_linux slang";
+qrencode tcl util_linux slang utf8proc";
 NATIVE_PACKAGES_DEPS_PREFIX="${PREFIX_NATIVE}";
 NATIVE_PACKAGES_DEPS_PYTHON="${PREFIX}/bin/python2";
 : ${PKG_LIBATOMIC_OPS_SHA256SUM:=587edf60817f56daf1e1ab38a4b3c729b8e846ff67b4f62a6157183708f099af};
@@ -781,6 +781,8 @@ NATIVE_PACKAGES_DEPS_PYTHON="${PREFIX}/bin/python2";
 : ${PKG_SLANG_URL:=https://www.jedsoft.org/releases/slang/slang-${PKG_SLANG_VERSION}.tar.bz2};
 : ${PKG_SLANG_IN_TREE:=1};
 : ${PKG_SLANG_MAKEFLAGS_BUILD_EXTRA:=-j1};
+: ${PKG_UTF8PROC_URLS_GIT:="utf8proc=https://github.com/JuliaStrings/utf8proc@master"};
+: ${PKG_UTF8PROC_IN_TREE:=1};
 
 #
 # Build target native_packages_deps_x11
@@ -1448,6 +1450,7 @@ fi;
 : ${PKG_TMUX_SHA256SUM:=55313e132f0f42de7e020bf6323a1939ee02ab79c48634aa07475db41573852b};
 : ${PKG_TMUX_VERSION:=2.3};
 : ${PKG_TMUX_URL:=https://github.com/tmux/tmux/releases/download/${PKG_TMUX_VERSION}/tmux-${PKG_TMUX_VERSION}.tar.gz};
+: ${PKG_TMUX_CONFIGURE_ARGS_EXTRA:=--enable-utf8proc};
 : ${PKG_TZDB_SHA256SUM:=b1c23c7825f5f842e6e1ddb702efe85b1c22bdf0e41815b927cfc04a28372962};
 : ${PKG_TZDB_VERSION:=2018e};
 : ${PKG_TZDB_URL:=https://data.iana.org/time-zones/releases/tzdb-${PKG_TZDB_VERSION}.tar.lz};