Cleaned up some things related to the previous merge.

GNUmakefile

@@ -38,6 +38,10 @@ export CXXFLAGS
 export LDFLAGS
 export NODEBUG
 export EXAMPLE
+export PREFIX
+
+# for Debian - see https://github.com/andlabs/libui/pull/10
+export DESTDIR
 
 # other important variables
 export OBJDIR
@@ -57,10 +61,9 @@ test: libui
 example: libui
 	@$(MAKE) -f build/GNUmakefile.example inlibuibuild=1
 
-# TODO examples rule? --> That's it right ?
 examples:
-	@$(MAKE) -f GNUmakefile example EXAMPLE=histogram
 	#@$(MAKE) -f GNUmakefile example EXAMPLE=controlgallery 
+	@$(MAKE) -f GNUmakefile example EXAMPLE=histogram
 
 .PHONY: examples
 

build/GNUmakefile.libui

@@ -41,4 +41,5 @@ endif
 include build/GNUbase$(TOOLCHAIN).mk
 
 # install rule is OS specific
+# TODO probably better off making it a toolchain-wide rule
 include $(OS)/GNUinstall.mk