configure.ac: use pkg-config to get ncursesw header location

Don't assume ncursesw headers are in ../usr/include/ncursesw/..
On a pure build/system without legacy ncurses that may not be true.
Since we're using pkg-config let it provide the correct include path.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Makefile.am

@@ -102,6 +102,7 @@ slabtop_SOURCES = slabtop.c lib/strutils.c lib/fileutils.c
 slabtop_LDADD = $(LDADD) @NCURSES_LIBS@
 watch_SOURCES = watch.c lib/strutils.c lib/fileutils.c
 watch_LDADD = @WATCH_NCURSES_LIBS@ $(CYGWINFLAGS)
+watch_CFLAGS = @WATCH_NCURSES_CFLAGS@
 top_top_SOURCES = \
 	top/top.h \
 	top/top.c \

configure.ac

@@ -134,7 +134,8 @@ else
   ])
   AM_CONDITIONAL(WITH_NCURSES, true)
   if test "$enable_watch8bit" = yes; then
-    PKG_CHECK_MODULES([NCURSESW], [ncursesw], [WATCH_NCURSES_LIBS="$NCURSESW_LIBS"], [
+    PKG_CHECK_MODULES([NCURSESW], [ncursesw], [WATCH_NCURSES_LIBS="$NCURSESW_LIBS"]
+    [WATCH_NCURSES_CFLAGS="$NCURSESW_CFLAGS"], [
       AC_CHECK_LIB([ncursesw], [addwstr], [WATCH_NCURSES_LIBS=-lncursesw],
                    [AC_MSG_ERROR([Cannot find ncurses wide library ncursesw with --enable-watch8bit])])
     ])
@@ -144,6 +145,7 @@ else
 fi
 AC_SUBST([NCURSES_LIBS])
 AC_SUBST([WATCH_NCURSES_LIBS])
+AC_SUBST([WATCH_NCURSES_CFLAGS])
 
 AC_ARG_WITH([systemd],
   [AS_HELP_STRING([--with-systemd], [enable systemd support])],

watch.c

@@ -52,10 +52,8 @@
 # define _XOPEN_SOURCE_EXTENDED 1
 # include <wchar.h>
 # include <wctype.h>
-# include <ncursesw/ncurses.h>
-#else
-# include <ncurses.h>
 #endif	/* WITH_WATCH8BIT */
+#include <ncurses.h>
 
 #ifdef FORCE_8BIT
 # undef isprint