diff -up libftdi-0.18/aclocal.m4.libusb libftdi-0.18/aclocal.m4
--- libftdi-0.18/aclocal.m4.libusb	2010-12-06 11:22:51.207159911 +0100
+++ libftdi-0.18/aclocal.m4	2010-12-06 11:23:46.692156198 +0100
@@ -7968,6 +7968,162 @@ m4_ifndef([_LT_AC_LANG_RC_CONFIG],	[AC_D
 m4_ifndef([AC_LIBTOOL_CONFIG],		[AC_DEFUN([AC_LIBTOOL_CONFIG])])
 m4_ifndef([_LT_AC_FILE_LTDLL_C],	[AC_DEFUN([_LT_AC_FILE_LTDLL_C])])
 
+# pkg.m4 - Macros to locate and utilise pkg-config.            -*- Autoconf -*-
+# 
+# Copyright © 2004 Scott James Remnant <scott@netsplit.com>.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+#
+# As a special exception to the GNU General Public License, if you
+# distribute this file as part of a program that contains a
+# configuration script generated by Autoconf, you may include it under
+# the same distribution terms that you use for the rest of that program.
+
+# PKG_PROG_PKG_CONFIG([MIN-VERSION])
+# ----------------------------------
+AC_DEFUN([PKG_PROG_PKG_CONFIG],
+[m4_pattern_forbid([^_?PKG_[A-Z_]+$])
+m4_pattern_allow([^PKG_CONFIG(_PATH)?$])
+AC_ARG_VAR([PKG_CONFIG], [path to pkg-config utility])dnl
+if test "x$ac_cv_env_PKG_CONFIG_set" != "xset"; then
+	AC_PATH_TOOL([PKG_CONFIG], [pkg-config])
+fi
+if test -n "$PKG_CONFIG"; then
+	_pkg_min_version=m4_default([$1], [0.9.0])
+	AC_MSG_CHECKING([pkg-config is at least version $_pkg_min_version])
+	if $PKG_CONFIG --atleast-pkgconfig-version $_pkg_min_version; then
+		AC_MSG_RESULT([yes])
+	else
+		AC_MSG_RESULT([no])
+		PKG_CONFIG=""
+	fi
+		
+fi[]dnl
+])# PKG_PROG_PKG_CONFIG
+
+# PKG_CHECK_EXISTS(MODULES, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
+#
+# Check to see whether a particular set of modules exists.  Similar
+# to PKG_CHECK_MODULES(), but does not set variables or print errors.
+#
+#
+# Similar to PKG_CHECK_MODULES, make sure that the first instance of
+# this or PKG_CHECK_MODULES is called, or make sure to call
+# PKG_CHECK_EXISTS manually
+# --------------------------------------------------------------
+AC_DEFUN([PKG_CHECK_EXISTS],
+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
+if test -n "$PKG_CONFIG" && \
+    AC_RUN_LOG([$PKG_CONFIG --exists --print-errors "$1"]); then
+  m4_ifval([$2], [$2], [:])
+m4_ifvaln([$3], [else
+  $3])dnl
+fi])
+
+
+# _PKG_CONFIG([VARIABLE], [COMMAND], [MODULES])
+# ---------------------------------------------
+m4_define([_PKG_CONFIG],
+[if test -n "$$1"; then
+    pkg_cv_[]$1="$$1"
+ elif test -n "$PKG_CONFIG"; then
+    PKG_CHECK_EXISTS([$3],
+                     [pkg_cv_[]$1=`$PKG_CONFIG --[]$2 "$3" 2>/dev/null`],
+		     [pkg_failed=yes])
+ else
+    pkg_failed=untried
+fi[]dnl
+])# _PKG_CONFIG
+
+# _PKG_SHORT_ERRORS_SUPPORTED
+# -----------------------------
+AC_DEFUN([_PKG_SHORT_ERRORS_SUPPORTED],
+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])
+if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
+        _pkg_short_errors_supported=yes
+else
+        _pkg_short_errors_supported=no
+fi[]dnl
+])# _PKG_SHORT_ERRORS_SUPPORTED
+
+
+# PKG_CHECK_MODULES(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
+# [ACTION-IF-NOT-FOUND])
+#
+#
+# Note that if there is a possibility the first call to
+# PKG_CHECK_MODULES might not happen, you should be sure to include an
+# explicit call to PKG_PROG_PKG_CONFIG in your configure.ac
+#
+#
+# --------------------------------------------------------------
+AC_DEFUN([PKG_CHECK_MODULES],
+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
+AC_ARG_VAR([$1][_CFLAGS], [C compiler flags for $1, overriding pkg-config])dnl
+AC_ARG_VAR([$1][_LIBS], [linker flags for $1, overriding pkg-config])dnl
+
+pkg_failed=no
+AC_MSG_CHECKING([for $1])
+
+_PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
+_PKG_CONFIG([$1][_LIBS], [libs], [$2])
+
+m4_define([_PKG_TEXT], [Alternatively, you may set the environment variables $1[]_CFLAGS
+and $1[]_LIBS to avoid the need to call pkg-config.
+See the pkg-config man page for more details.])
+
+if test $pkg_failed = yes; then
+        _PKG_SHORT_ERRORS_SUPPORTED
+        if test $_pkg_short_errors_supported = yes; then
+	        $1[]_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors "$2" 2>&1`
+        else 
+	        $1[]_PKG_ERRORS=`$PKG_CONFIG --print-errors "$2" 2>&1`
+        fi
+	# Put the nasty error message in config.log where it belongs
+	echo "$$1[]_PKG_ERRORS" >&AS_MESSAGE_LOG_FD
+
+	ifelse([$4], , [AC_MSG_ERROR(dnl
+[Package requirements ($2) were not met:
+
+$$1_PKG_ERRORS
+
+Consider adjusting the PKG_CONFIG_PATH environment variable if you
+installed software in a non-standard prefix.
+
+_PKG_TEXT
+])],
+		[AC_MSG_RESULT([no])
+                $4])
+elif test $pkg_failed = untried; then
+	ifelse([$4], , [AC_MSG_FAILURE(dnl
+[The pkg-config script could not be found or is too old.  Make sure it
+is in your PATH or set the PKG_CONFIG environment variable to the full
+path to pkg-config.
+
+_PKG_TEXT
+
+To get pkg-config, see <http://pkg-config.freedesktop.org/>.])],
+		[$4])
+else
+	$1[]_CFLAGS=$pkg_cv_[]$1[]_CFLAGS
+	$1[]_LIBS=$pkg_cv_[]$1[]_LIBS
+        AC_MSG_RESULT([yes])
+	ifelse([$3], , :, [$3])
+fi[]dnl
+])# PKG_CHECK_MODULES
+
 # Copyright (C) 2002, 2003, 2005, 2006, 2007, 2008  Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
diff -up libftdi-0.18/configure.in.libusb libftdi-0.18/configure.in
--- libftdi-0.18/configure.in.libusb	2010-06-25 17:04:13.000000000 +0200
+++ libftdi-0.18/configure.in	2010-12-06 11:20:30.748660156 +0100
@@ -7,30 +7,12 @@ AC_PROG_CC
 AM_PROG_LIBTOOL
 AC_PROG_CXX
 
-dnl check for libusb-config
-AC_CHECK_TOOL(HAVELIBUSB, libusb-config)
-
-if test ! -z "$HAVELIBUSB"; then
-   LIBUSB_CFLAGS=`$HAVELIBUSB --cflags`
-   LIBUSB_LIBS=`$HAVELIBUSB --libs`
-
+dnl check for libusb
+PKG_CHECK_MODULES(LIBUSB, libusb,
+[
    CFLAGS="$CFLAGS $LIBUSB_CFLAGS"
    LIBS="$LIBS $LIBUSB_LIBS"
-else
-   AC_MSG_ERROR([*** libusb-config not found. You need a working libusb installation.])
-fi
-
-dnl check for version of libusb
-AC_MSG_CHECKING([if libusb version is >= 0.1.7])
-libusb_version_needed="1007"
-libusb_version=`$HAVELIBUSB --version | sed -e "s/libusb //" | awk 'BEGIN { FS = "."; } { printf "%d", ($''1 * 1000 + $''2) * 1000 + $''3;}'`
-
-if test $libusb_version -lt $libusb_version_needed; then
-   AC_MSG_RESULT(no)
-   AC_MSG_ERROR([*** libusb is too old ($libusb_version). You need a libusb installation newer or equal to 0.1.7.])
-else
-   AC_MSG_RESULT(yes)
-fi
+])
 
 ENABLE_ASYNC_MODE=0
 AC_ARG_WITH(async-mode,
diff -up libftdi-0.18/configure.libusb libftdi-0.18/configure
--- libftdi-0.18/configure.libusb	2010-12-06 11:20:51.143153972 +0100
+++ libftdi-0.18/configure	2010-12-06 11:23:52.276158997 +0100
@@ -815,7 +815,9 @@ BOOST_CPPFLAGS
 BUILD_EXAMPLES_FALSE
 BUILD_EXAMPLES_TRUE
 ENABLE_ASYNC_MODE
-HAVELIBUSB
+LIBUSB_LIBS
+LIBUSB_CFLAGS
+PKG_CONFIG
 CXXCPP
 am__fastdepCXX_FALSE
 am__fastdepCXX_TRUE
@@ -957,7 +959,10 @@ CPP
 CXX
 CXXFLAGS
 CCC
-CXXCPP'
+CXXCPP
+PKG_CONFIG
+LIBUSB_CFLAGS
+LIBUSB_LIBS'
 
 
 # Initialize some variables set by options.
@@ -1629,6 +1634,10 @@ Some influential environment variables:
   CXX         C++ compiler command
   CXXFLAGS    C++ compiler flags
   CXXCPP      C++ preprocessor
+  PKG_CONFIG  path to pkg-config utility
+  LIBUSB_CFLAGS
+              C compiler flags for LIBUSB, overriding pkg-config
+  LIBUSB_LIBS linker flags for LIBUSB, overriding pkg-config
 
 Use these variables to override the choices made by `configure' or to help
 it to find libraries and programs with nonstandard names/locations.
@@ -15290,25 +15299,30 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 
 
-if test -n "$ac_tool_prefix"; then
-  # Extract the first word of "${ac_tool_prefix}libusb-config", so it can be a program name with args.
-set dummy ${ac_tool_prefix}libusb-config; ac_word=$2
+
+
+if test "x$ac_cv_env_PKG_CONFIG_set" != "xset"; then
+	if test -n "$ac_tool_prefix"; then
+  # Extract the first word of "${ac_tool_prefix}pkg-config", so it can be a program name with args.
+set dummy ${ac_tool_prefix}pkg-config; ac_word=$2
 { $as_echo "$as_me:$LINENO: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_HAVELIBUSB+set}" = set; then
+if test "${ac_cv_path_PKG_CONFIG+set}" = set; then
   $as_echo_n "(cached) " >&6
 else
-  if test -n "$HAVELIBUSB"; then
-  ac_cv_prog_HAVELIBUSB="$HAVELIBUSB" # Let the user override the test.
-else
-as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+  case $PKG_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_PKG_CONFIG="$PKG_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
 for as_dir in $PATH
 do
   IFS=$as_save_IFS
   test -z "$as_dir" && as_dir=.
   for ac_exec_ext in '' $ac_executable_extensions; do
   if { test -f "$as_dir/$ac_word$ac_exec_ext" && $as_test_x "$as_dir/$ac_word$ac_exec_ext"; }; then
-    ac_cv_prog_HAVELIBUSB="${ac_tool_prefix}libusb-config"
+    ac_cv_path_PKG_CONFIG="$as_dir/$ac_word$ac_exec_ext"
     $as_echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" >&5
     break 2
   fi
@@ -15316,12 +15330,13 @@ done
 done
 IFS=$as_save_IFS
 
+  ;;
+esac
 fi
-fi
-HAVELIBUSB=$ac_cv_prog_HAVELIBUSB
-if test -n "$HAVELIBUSB"; then
-  { $as_echo "$as_me:$LINENO: result: $HAVELIBUSB" >&5
-$as_echo "$HAVELIBUSB" >&6; }
+PKG_CONFIG=$ac_cv_path_PKG_CONFIG
+if test -n "$PKG_CONFIG"; then
+  { $as_echo "$as_me:$LINENO: result: $PKG_CONFIG" >&5
+$as_echo "$PKG_CONFIG" >&6; }
 else
   { $as_echo "$as_me:$LINENO: result: no" >&5
 $as_echo "no" >&6; }
@@ -15329,26 +15344,28 @@ fi
 
 
 fi
-if test -z "$ac_cv_prog_HAVELIBUSB"; then
-  ac_ct_HAVELIBUSB=$HAVELIBUSB
-  # Extract the first word of "libusb-config", so it can be a program name with args.
-set dummy libusb-config; ac_word=$2
+if test -z "$ac_cv_path_PKG_CONFIG"; then
+  ac_pt_PKG_CONFIG=$PKG_CONFIG
+  # Extract the first word of "pkg-config", so it can be a program name with args.
+set dummy pkg-config; ac_word=$2
 { $as_echo "$as_me:$LINENO: checking for $ac_word" >&5
 $as_echo_n "checking for $ac_word... " >&6; }
-if test "${ac_cv_prog_ac_ct_HAVELIBUSB+set}" = set; then
+if test "${ac_cv_path_ac_pt_PKG_CONFIG+set}" = set; then
   $as_echo_n "(cached) " >&6
 else
-  if test -n "$ac_ct_HAVELIBUSB"; then
-  ac_cv_prog_ac_ct_HAVELIBUSB="$ac_ct_HAVELIBUSB" # Let the user override the test.
-else
-as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+  case $ac_pt_PKG_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_ac_pt_PKG_CONFIG="$ac_pt_PKG_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
 for as_dir in $PATH
 do
   IFS=$as_save_IFS
   test -z "$as_dir" && as_dir=.
   for ac_exec_ext in '' $ac_executable_extensions; do
   if { test -f "$as_dir/$ac_word$ac_exec_ext" && $as_test_x "$as_dir/$ac_word$ac_exec_ext"; }; then
-    ac_cv_prog_ac_ct_HAVELIBUSB="libusb-config"
+    ac_cv_path_ac_pt_PKG_CONFIG="$as_dir/$ac_word$ac_exec_ext"
     $as_echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" >&5
     break 2
   fi
@@ -15356,19 +15373,20 @@ done
 done
 IFS=$as_save_IFS
 
+  ;;
+esac
 fi
-fi
-ac_ct_HAVELIBUSB=$ac_cv_prog_ac_ct_HAVELIBUSB
-if test -n "$ac_ct_HAVELIBUSB"; then
-  { $as_echo "$as_me:$LINENO: result: $ac_ct_HAVELIBUSB" >&5
-$as_echo "$ac_ct_HAVELIBUSB" >&6; }
+ac_pt_PKG_CONFIG=$ac_cv_path_ac_pt_PKG_CONFIG
+if test -n "$ac_pt_PKG_CONFIG"; then
+  { $as_echo "$as_me:$LINENO: result: $ac_pt_PKG_CONFIG" >&5
+$as_echo "$ac_pt_PKG_CONFIG" >&6; }
 else
   { $as_echo "$as_me:$LINENO: result: no" >&5
 $as_echo "no" >&6; }
 fi
 
-  if test "x$ac_ct_HAVELIBUSB" = x; then
-    HAVELIBUSB=""
+  if test "x$ac_pt_PKG_CONFIG" = x; then
+    PKG_CONFIG=""
   else
     case $cross_compiling:$ac_tool_warned in
 yes:)
@@ -15376,39 +15394,138 @@ yes:)
 $as_echo "$as_me: WARNING: using cross tools not prefixed with host triplet" >&2;}
 ac_tool_warned=yes ;;
 esac
-    HAVELIBUSB=$ac_ct_HAVELIBUSB
+    PKG_CONFIG=$ac_pt_PKG_CONFIG
   fi
 else
-  HAVELIBUSB="$ac_cv_prog_HAVELIBUSB"
+  PKG_CONFIG="$ac_cv_path_PKG_CONFIG"
 fi
 
+fi
+if test -n "$PKG_CONFIG"; then
+	_pkg_min_version=0.9.0
+	{ $as_echo "$as_me:$LINENO: checking pkg-config is at least version $_pkg_min_version" >&5
+$as_echo_n "checking pkg-config is at least version $_pkg_min_version... " >&6; }
+	if $PKG_CONFIG --atleast-pkgconfig-version $_pkg_min_version; then
+		{ $as_echo "$as_me:$LINENO: result: yes" >&5
+$as_echo "yes" >&6; }
+	else
+		{ $as_echo "$as_me:$LINENO: result: no" >&5
+$as_echo "no" >&6; }
+		PKG_CONFIG=""
+	fi
 
-if test ! -z "$HAVELIBUSB"; then
-   LIBUSB_CFLAGS=`$HAVELIBUSB --cflags`
-   LIBUSB_LIBS=`$HAVELIBUSB --libs`
+fi
 
-   CFLAGS="$CFLAGS $LIBUSB_CFLAGS"
-   LIBS="$LIBS $LIBUSB_LIBS"
+pkg_failed=no
+{ $as_echo "$as_me:$LINENO: checking for LIBUSB" >&5
+$as_echo_n "checking for LIBUSB... " >&6; }
+
+if test -n "$LIBUSB_CFLAGS"; then
+    pkg_cv_LIBUSB_CFLAGS="$LIBUSB_CFLAGS"
+ elif test -n "$PKG_CONFIG"; then
+    if test -n "$PKG_CONFIG" && \
+    { ($as_echo "$as_me:$LINENO: \$PKG_CONFIG --exists --print-errors \"libusb\"") >&5
+  ($PKG_CONFIG --exists --print-errors "libusb") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; then
+  pkg_cv_LIBUSB_CFLAGS=`$PKG_CONFIG --cflags "libusb" 2>/dev/null`
 else
-   { { $as_echo "$as_me:$LINENO: error: *** libusb-config not found. You need a working libusb installation." >&5
-$as_echo "$as_me: error: *** libusb-config not found. You need a working libusb installation." >&2;}
-   { (exit 1); exit 1; }; }
+  pkg_failed=yes
+fi
+ else
+    pkg_failed=untried
+fi
+if test -n "$LIBUSB_LIBS"; then
+    pkg_cv_LIBUSB_LIBS="$LIBUSB_LIBS"
+ elif test -n "$PKG_CONFIG"; then
+    if test -n "$PKG_CONFIG" && \
+    { ($as_echo "$as_me:$LINENO: \$PKG_CONFIG --exists --print-errors \"libusb\"") >&5
+  ($PKG_CONFIG --exists --print-errors "libusb") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; then
+  pkg_cv_LIBUSB_LIBS=`$PKG_CONFIG --libs "libusb" 2>/dev/null`
+else
+  pkg_failed=yes
+fi
+ else
+    pkg_failed=untried
 fi
 
-{ $as_echo "$as_me:$LINENO: checking if libusb version is >= 0.1.7" >&5
-$as_echo_n "checking if libusb version is >= 0.1.7... " >&6; }
-libusb_version_needed="1007"
-libusb_version=`$HAVELIBUSB --version | sed -e "s/libusb //" | awk 'BEGIN { FS = "."; } { printf "%d", ($''1 * 1000 + $''2) * 1000 + $''3;}'`
 
-if test $libusb_version -lt $libusb_version_needed; then
-   { $as_echo "$as_me:$LINENO: result: no" >&5
-$as_echo "no" >&6; }
-   { { $as_echo "$as_me:$LINENO: error: *** libusb is too old ($libusb_version). You need a libusb installation newer or equal to 0.1.7." >&5
-$as_echo "$as_me: error: *** libusb is too old ($libusb_version). You need a libusb installation newer or equal to 0.1.7." >&2;}
+
+if test $pkg_failed = yes; then
+
+if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
+        _pkg_short_errors_supported=yes
+else
+        _pkg_short_errors_supported=no
+fi
+        if test $_pkg_short_errors_supported = yes; then
+	        LIBUSB_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors "libusb" 2>&1`
+        else
+	        LIBUSB_PKG_ERRORS=`$PKG_CONFIG --print-errors "libusb" 2>&1`
+        fi
+	# Put the nasty error message in config.log where it belongs
+	echo "$LIBUSB_PKG_ERRORS" >&5
+
+	{ { $as_echo "$as_me:$LINENO: error: Package requirements (libusb) were not met:
+
+$LIBUSB_PKG_ERRORS
+
+Consider adjusting the PKG_CONFIG_PATH environment variable if you
+installed software in a non-standard prefix.
+
+Alternatively, you may set the environment variables LIBUSB_CFLAGS
+and LIBUSB_LIBS to avoid the need to call pkg-config.
+See the pkg-config man page for more details.
+" >&5
+$as_echo "$as_me: error: Package requirements (libusb) were not met:
+
+$LIBUSB_PKG_ERRORS
+
+Consider adjusting the PKG_CONFIG_PATH environment variable if you
+installed software in a non-standard prefix.
+
+Alternatively, you may set the environment variables LIBUSB_CFLAGS
+and LIBUSB_LIBS to avoid the need to call pkg-config.
+See the pkg-config man page for more details.
+" >&2;}
    { (exit 1); exit 1; }; }
+elif test $pkg_failed = untried; then
+	{ { $as_echo "$as_me:$LINENO: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+{ { $as_echo "$as_me:$LINENO: error: The pkg-config script could not be found or is too old.  Make sure it
+is in your PATH or set the PKG_CONFIG environment variable to the full
+path to pkg-config.
+
+Alternatively, you may set the environment variables LIBUSB_CFLAGS
+and LIBUSB_LIBS to avoid the need to call pkg-config.
+See the pkg-config man page for more details.
+
+To get pkg-config, see <http://pkg-config.freedesktop.org/>.
+See \`config.log' for more details." >&5
+$as_echo "$as_me: error: The pkg-config script could not be found or is too old.  Make sure it
+is in your PATH or set the PKG_CONFIG environment variable to the full
+path to pkg-config.
+
+Alternatively, you may set the environment variables LIBUSB_CFLAGS
+and LIBUSB_LIBS to avoid the need to call pkg-config.
+See the pkg-config man page for more details.
+
+To get pkg-config, see <http://pkg-config.freedesktop.org/>.
+See \`config.log' for more details." >&2;}
+   { (exit 1); exit 1; }; }; }
 else
-   { $as_echo "$as_me:$LINENO: result: yes" >&5
+	LIBUSB_CFLAGS=$pkg_cv_LIBUSB_CFLAGS
+	LIBUSB_LIBS=$pkg_cv_LIBUSB_LIBS
+        { $as_echo "$as_me:$LINENO: result: yes" >&5
 $as_echo "yes" >&6; }
+
+   CFLAGS="$CFLAGS $LIBUSB_CFLAGS"
+   LIBS="$LIBS $LIBUSB_LIBS"
+
 fi
 
 ENABLE_ASYNC_MODE=0