Suit symbols work on all terminals now.

Makefile

@@ -13,7 +13,7 @@ OBJECTS = ${LIB_DIR}/frame.o    \
           ${LIB_DIR}/keyboard.o \
           ${LIB_DIR}/display.o  \
           ${LIB_DIR}/game.o
-LDFLAGS = -lncurses
+LDFLAGS = -lncursesw
 
 tty-solitaire: ${OBJECTS}
 	${CC} ${CFLAGS} ${LDFLAGS} ${SRC} -o ${OUTPUT} ${OBJECTS}

lib/util.c

@@ -2,7 +2,7 @@
 #include <locale.h>
 
 void initialize_curses() {
-  setlocale(LC_ALL, "");    /* supporting unicode characters          */
+  setlocale(LC_ALL, "en_US.utf-8");  /* supporting unicode characters          */
   initscr();                         /* initialize the terminal in curses mode */
   raw();                             /* disable line buffers                   */
   noecho();                          /* character echo is unnecessary          */