From 57db10acf0aafa3fa5160a8f5c869d5e0ae51796 Mon Sep 17 00:00:00 2001
From: Romuald Conty <romuald@libnfc.org>
Date: Sun, 9 Oct 2011 19:54:25 +0000
Subject: [PATCH] m4/libusb: search for "libusb-legacy" module if "libusb"
 module is not found

---
 m4/libnfc_check_libusb.m4 | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/m4/libnfc_check_libusb.m4 b/m4/libnfc_check_libusb.m4
index 9a02d8f..0d5b197 100644
--- a/m4/libnfc_check_libusb.m4
+++ b/m4/libnfc_check_libusb.m4
@@ -20,7 +20,7 @@ AC_DEFUN([LIBNFC_CHECK_LIBUSB],
       HAVE_LIBUSB=1
     fi
 
-    # Search using pkg-config
+    # Search using libusb module using pkg-config
     if test x"$HAVE_LIBUSB" = "x0"; then  
       if test x"$PKG_CONFIG" != "x"; then
         PKG_CHECK_MODULES([libusb], [libusb], [HAVE_LIBUSB=1], [HAVE_LIBUSB=0])
@@ -33,6 +33,19 @@ AC_DEFUN([LIBNFC_CHECK_LIBUSB],
       fi
     fi
 
+    # Search using libusb-legacy module using pkg-config
+    if test x"$HAVE_LIBUSB" = "x0"; then  
+      if test x"$PKG_CONFIG" != "x"; then
+        PKG_CHECK_MODULES([libusb], [libusb-legacy], [HAVE_LIBUSB=1], [HAVE_LIBUSB=0])
+        if test x"$HAVE_LIBUSB" = "x1"; then
+          if test x"$PKG_CONFIG_REQUIRES" != x""; then
+            PKG_CONFIG_REQUIRES="$PKG_CONFIG_REQUIRES,"
+          fi
+          PKG_CONFIG_REQUIRES="$PKG_CONFIG_REQUIRES libusb"
+        fi
+      fi
+    fi
+
     # Search using libusb-config
     if test x"$HAVE_LIBUSB" = "x0"; then
       AC_PATH_PROG(libusb_CONFIG,libusb-config)