Ensure we link against the correct ncurses libraries.
https://bugs.gentoo.org/764470
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,11 +1,7 @@
 #AM_CFLAGS = --pedantic -Wall
 #-DDEBUG
 
-if HAVE_WIDE_NCURSES
-nudoku_LDADD = -lncursesw
-else
-nudoku_LDADD = -lncurses
-endif
+nudoku_LDADD = ${ncurses_LIBS}
 bin_PROGRAMS = nudoku
 nudoku_SOURCES = main.c sudoku.c sudoku.h
 
--- a/configure.ac
+++ b/configure.ac
@@ -34,15 +34,7 @@ the cairo development libraries, or compile without support (--disable-cairo)
 
 fi
 
-have_wide_ncurses=no
-AC_CHECK_LIB(ncursesw, initscr, [have_wide_ncurses=yes])
-if test $have_wide_ncurses = no; then
-   AC_CHECK_LIB(ncurses, initscr, [], [
-   echo "nudoku requires ncurses"
-   exit 1
-   ])
-fi
-AM_CONDITIONAL([HAVE_WIDE_NCURSES], [test $have_wide_ncurses = yes])
+PKG_CHECK_MODULES([ncurses], [ncurses])
 
 # Checks for header files.
 AC_CHECK_HEADERS([stdlib.h string.h unistd.h])