[bug#64576] [PATCH] gnu: libusb-compat: Compile with full path of libusb-1.0.so

[nathan via Guix-patches via <guix-patches@gnu.org>]

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fix bug#64409
In libusb-compat-0.1.8/libusb/libusb-dload.h, dlopen is used to load libusb.
We need to specify an absolute path.
With this fix, teensy_loader_cli doesn't immediately fail with a missing library error.
./pre-inst-env guix shell teensy-loader-cli -- teensy_loader_cli
If you merge the patch from bug#64563 first, you can't test this patch with teensy_loader_cli.

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From c0a8ecea0ce6f3954061a3d061a3243fa65c6cfb Mon Sep 17 00:00:00 2001
From: nathan <nathan_mail@nborghese.com>
Date: Mon, 10 Jul 2023 23:22:48 -0400
Subject: [PATCH] gnu: libusb-compat: Compile with full path of libusb-1.0.so

* gnu/packages/libusb.scm (libusb) [configure-flags]: Provide full path of
  libusb-1.0.so so dlopen works.
---
 gnu/packages/libusb.scm | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/libusb.scm b/gnu/packages/libusb.scm
index d0837c8a91..39586147ba 100644
--- a/gnu/packages/libusb.scm
+++ b/gnu/packages/libusb.scm
@@ -101,7 +101,10 @@ (define-public libusb-compat
     (build-system gnu-build-system)
     (arguments
      (list #:configure-flags
-           #~(list "--disable-static")))
+           #~(list "--disable-static"
+                   (string-append "LIBUSB_1_0_SONAME="
+                                  #$(this-package-input "libusb")
+                                  "/lib/libusb-1.0.so"))))
     (native-inputs
      (list autoconf automake libtool pkg-config))
     (inputs
-- 
2.41.0