From f6a0d67e7ce9e9b95d8576c8f494418a75de7f1c Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Sun, 3 Apr 2011 02:07:59 +0000
Subject: [PATCH] build: do not use shell calls to export empty opkg control
 files, speeds up package build and fixes some "Argument list too long" errors
 Patch by Thomas Langer from #8450

SVN-Revision: 26431
---
 include/package-ipkg.mk | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/package-ipkg.mk b/include/package-ipkg.mk
index 2360ac4d4ec..9cccff261a8 100644
--- a/include/package-ipkg.mk
+++ b/include/package-ipkg.mk
@@ -28,8 +28,10 @@ IPKG_BUILD:= \
 IPKG_STATE_DIR:=$(TARGET_DIR)/usr/lib/opkg
 
 define BuildIPKGVariable
+ifdef Package/$(1)/$(2)
   $(call shexport,Package/$(1)/$(2))
   $(1)_COMMANDS += $(SH_FUNC) var2file "$(call shvar,Package/$(1)/$(2))" $(2);
+endif
 endef
 
 PARENL :=(