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From: Kalin KOZHUHAROV <me.kalin@gmail.com>
Date: Wed, 16 Nov 2016 18:50:52 +0900
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To: Dan Luedtke <mail@danrl.com>
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Subject: Re: [WireGuard] Wireguard in OpenWRT/LEDE: FYI: Pull Request
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On Wed, Nov 16, 2016 at 6:34 PM, Dan Luedtke <mail@danrl.com> wrote:
> Hmm, could it be missing a line like
>
> $(INSTALL_DIR) $(1)/lib/netifd/proto/
>
> In the Makefile? Not sure why we would need to create it, shouldn't it be=
 there?
>
> Kalin, could you try again with the installdir line?
>
Currently the Makefile had this in:

define Package/wireguard-tools/install
    $(INSTALL_DIR) $(1)/usr/bin/
    $(INSTALL_BIN) $(PKG_BUILD_DIR)/src/tools/wg $(1)/usr/bin/
    $(INSTALL_BIN) ./files/wireguard.sh $(1)/lib/netifd/proto/
endef

I patched it:
--- a/srv/OpenWRT/openwrt/feeds/packages/net/wireguard/Makefile
2016-11-16 18:45:57.733060093 +0900
+++ b/srv/OpenWRT/openwrt/feeds/packages/net/wireguard/Makefile
2016-11-16 18:46:07.716948224 +0900
@@ -83,6 +83,7 @@
 define Package/wireguard-tools/install
     $(INSTALL_DIR) $(1)/usr/bin/
     $(INSTALL_BIN) $(PKG_BUILD_DIR)/src/tools/wg $(1)/usr/bin/
+    $(INSTALL_DIR) $(1)/lib/netifd/proto/
     $(INSTALL_BIN) ./files/wireguard.sh $(1)/lib/netifd/proto/
 endef

And it seems to work now. I guess this looks as expected:
./build_dir/target-mips_34kc_musl-1.1.15/WireGuard-experimental-0.0.2016111=
0/ipkg-ar71xx/wireguard-tools/
=E2=94=9C=E2=94=80=E2=94=80 CONTROL
=E2=94=82   =E2=94=9C=E2=94=80=E2=94=80 control
=E2=94=82   =E2=94=9C=E2=94=80=E2=94=80 postinst
=E2=94=82   =E2=94=94=E2=94=80=E2=94=80 prerm
=E2=94=9C=E2=94=80=E2=94=80 lib
=E2=94=82   =E2=94=94=E2=94=80=E2=94=80 netifd
=E2=94=82       =E2=94=94=E2=94=80=E2=94=80 proto
=E2=94=82           =E2=94=94=E2=94=80=E2=94=80 wireguard.sh
=E2=94=94=E2=94=80=E2=94=80 usr
    =E2=94=94=E2=94=80=E2=94=80 bin
        =E2=94=94=E2=94=80=E2=94=80 wg

(still compiling the rest)

Kalin.