[Buildroot] using pkg-config when building

[Daniel Laird]

If I try to use pkg-config when doing a cross-compile it does not work. 
Paths not found etc.

If I make the following modification to package/Makefile.in

@@ -91,6 +91,7 @@
 		OBJCOPY=$(TARGET_CROSS)objcopy \
 		CC_FOR_BUILD="$(HOSTCC)" \
 		PKG_CONFIG_SYSROOT=$(STAGING_DIR) \
+	
PKG_CONFIG_PATH=$(STAGING_DIR)/lib/pkgconfig:$(STAGING_DIR)/usr/lib/pkgconfig:$(STAGING_DIR)/usr/local/lib/pkgconfig
\
 		PKG_CONFIG=$(STAGING_DIR)/usr/bin/pkg-config

 This sets up the search path for pkgconfig and it will search these dirs
for pkgconfig files.  Seems to have made all the difference for me.  Maybe
this can make it into the tree.....

Cheers
Dan
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