[Buildroot] [PATCH 1/2] kconfig/lxdialog: get ncurses CFLAGS with pkg-config

["Bjørn Forsman" <bjorn.forsman@gmail.com>]

This makes "make menuconfig" also work on systems where ncurses is not
installed in a standard location (such as on NixOS).

This patch changes ccflags() so that it tries pkg-config first, and only
if pkg-config fails does it go back to the fallback/manual checks. This
is the same algorithm that ldflags() already uses.

[This patch is already applied upstream (will be part of linux v3.18):
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=be8af2d54a66911693eddc556e4f7a866670082b

I'm adding this instead of doing a full upstream kconfig sync because
(1) there was a conflict in one of the Buildroot kconfg patches (against
linux 3.18-rc1), (2) adding this patch won't create any conflict next
time someone re-syncs kconfig with linux and (3) because this is easier
to review.
]

Signed-off-by: Bj?rn Forsman <bjorn.forsman@gmail.com>
---
 support/kconfig/lxdialog/check-lxdialog.sh | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
 mode change 100644 => 100755 support/kconfig/lxdialog/check-lxdialog.sh

diff --git a/support/kconfig/lxdialog/check-lxdialog.sh b/support/kconfig/lxdialog/check-lxdialog.sh
old mode 100644
new mode 100755
index 4789b72..3ce0a23
--- a/support/kconfig/lxdialog/check-lxdialog.sh
+++ b/support/kconfig/lxdialog/check-lxdialog.sh
@@ -21,7 +21,11 @@ ldflags()
 # Where is ncurses.h?
 ccflags()
 {
-	if [ -f /usr/include/ncursesw/curses.h ]; then
+	if pkg-config --cflags ncursesw 2>/dev/null; then
+		echo '-DCURSES_LOC="<ncurses.h>" -DNCURSES_WIDECHAR=1'
+	elif pkg-config --cflags ncurses 2>/dev/null; then
+		echo '-DCURSES_LOC="<ncurses.h>"'
+	elif [ -f /usr/include/ncursesw/curses.h ]; then
 		echo '-I/usr/include/ncursesw -DCURSES_LOC="<curses.h>"'
 		echo ' -DNCURSES_WIDECHAR=1'
 	elif [ -f /usr/include/ncurses/ncurses.h ]; then
-- 
2.1.2