busybox: look at kernel headers for include files as well

E.G. for flash_* applets.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

CHANGES

@@ -1,6 +1,6 @@
 2009.11, Not released yet:
 
-	Updated/fixed packages: dbus, gvfs
+	Updated/fixed packages: busybox, dbus, gvfs
 
 2009.11-rc1, Released November 23rd, 2009:
 

package/busybox/busybox.mk

@@ -18,6 +18,7 @@ BUSYBOX_SITE:=http://www.busybox.net/downloads
 endif
 
 BUSYBOX_UNZIP=$(BZCAT)
+BUSYBOX_CFLAGS=$(TARGET_CFLAGS) -I$(LINUX_HEADERS_DIR)/include
 
 ifndef BUSYBOX_CONFIG_FILE
 BUSYBOX_CONFIG_FILE=$(call qstrip,$(BR2_PACKAGE_BUSYBOX_CONFIG))
@@ -100,13 +101,13 @@ $(BUSYBOX_DIR)/busybox: $(BUSYBOX_DIR)/.config
 	$(MAKE) CC=$(TARGET_CC) CROSS_COMPILE="$(TARGET_CROSS)" \
 		CROSS="$(TARGET_CROSS)" PREFIX="$(TARGET_DIR)" \
 		ARCH=$(KERNEL_ARCH) \
-		EXTRA_CFLAGS="$(TARGET_CFLAGS)" -C $(BUSYBOX_DIR)
+		EXTRA_CFLAGS="$(BUSYBOX_CFLAGS)" -C $(BUSYBOX_DIR)
 ifeq ($(BR2_PREFER_IMA)$(BR2_PACKAGE_BUSYBOX_SNAPSHOT),yy)
 	rm -f $@
 	$(MAKE) CC=$(TARGET_CC) CROSS_COMPILE="$(TARGET_CROSS)" \
 		CROSS="$(TARGET_CROSS)" PREFIX="$(TARGET_DIR)" \
 		ARCH=$(KERNEL_ARCH) STRIP="$(STRIPCMD)" \
-		EXTRA_CFLAGS="$(TARGET_CFLAGS)" -C $(BUSYBOX_DIR) \
+		EXTRA_CFLAGS="$(BUSYBOX_CFLAGS)" -C $(BUSYBOX_DIR) \
 		-f scripts/Makefile.IMA
 endif
 
@@ -115,7 +116,7 @@ ifeq ($(BR2_PACKAGE_BUSYBOX_FULLINSTALL),y)
 	$(MAKE) CC=$(TARGET_CC) CROSS_COMPILE="$(TARGET_CROSS)" \
 		CROSS="$(TARGET_CROSS)" PREFIX="$(TARGET_DIR)" \
 		ARCH=$(KERNEL_ARCH) \
-		EXTRA_CFLAGS="$(TARGET_CFLAGS)" -C $(BUSYBOX_DIR) install
+		EXTRA_CFLAGS="$(BUSYBOX_CFLAGS)" -C $(BUSYBOX_DIR) install
 else
 	install -D -m 0755 $(BUSYBOX_DIR)/busybox $(TARGET_DIR)/bin/busybox
 endif