ncurses widechar functions are only available if the correct macros are
defined. Use CFLAGS and LDFLAGS from pkgconfig to ensure that widechar
functions are available.

From 9b71952bfb29e036b13c16d621febff76e84e3e4 Mon Sep 17 00:00:00 2001
From: Violet Purcell <vimproved@inventati.org>
Date: Tue, 11 Jul 2023 15:45:05 -0400
Subject: [PATCH] Use pkg-config for correct ncursesw CFLAGS and LDFLAGS

--- a/Makefile
+++ b/Makefile
@@ -21,8 +21,9 @@
 include Makefile.cfg
 
 export CC = gcc -pthread
-export CFLAGS += -I. -Wall -Os -ggdb -D_GNU_SOURCE -fPIC
-export LDLIBS += -lncursesw
+export PKG_CONFIG ?= pkg-config
+export CFLAGS += -I. -Wall -Os -ggdb -D_GNU_SOURCE -fPIC $(shell ${PKG_CONFIG} --cflags ncursesw)
+export LDLIBS += $(shell ${PKG_CONFIG} --libs ncursesw)
 
 SONAME  := libstfl.so.0
 VERSION := 0.24
-- 
2.41.0