diff -Naur libftdi-0.19/configure.in libftdi-0.19-mod/configure.in

--- libftdi-0.19/configure.in	2011-05-20 17:30:40.000000000 +0300

+++ libftdi-0.19-mod/configure.in	2011-06-18 08:38:02.000000000 +0300

@@ -7,30 +7,12 @@

 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,