Require pkg-config to find libusb-1.0, and fix libusb.h #includes

Makefile.am

@@ -15,7 +15,7 @@ EXTRA_DIST	= example.conf m4/gnulib-cache.m4 linux-usb-cgminer \
 
 SUBDIRS		= lib compat ccan
 
-INCLUDES	= $(PTHREAD_FLAGS) -fno-strict-aliasing $(JANSSON_INCLUDES) $(USB_FLAGS)
+INCLUDES	= $(PTHREAD_FLAGS) -fno-strict-aliasing $(JANSSON_INCLUDES)
 
 bin_PROGRAMS	= cgminer
 
@@ -24,13 +24,13 @@ bin_SCRIPTS	= *.cl
 cgminer_LDFLAGS	= $(PTHREAD_FLAGS)
 cgminer_LDADD	= $(DLOPEN_FLAGS) @LIBCURL_LIBS@ @JANSSON_LIBS@ @PTHREAD_LIBS@ \
 		  @OPENCL_LIBS@ @NCURSES_LIBS@ @PDCURSES_LIBS@ @WS2_LIBS@ \
-		  @UDEV_LIBS@ @USB_LIBS@ \
+		  @UDEV_LIBS@ @LIBUSB_LIBS@ \
 		  @MATH_LIBS@ lib/libgnu.a ccan/libccan.a
 
 if HAVE_WINDOWS
-cgminer_CPPFLAGS = -I$(top_builddir)/lib -I$(top_srcdir)/lib @OPENCL_FLAGS@
+cgminer_CPPFLAGS = -I$(top_builddir)/lib -I$(top_srcdir)/lib @OPENCL_FLAGS@ @LIBUSB_CFLAGS@
 else
-cgminer_CPPFLAGS = -I$(top_builddir)/lib -I$(top_srcdir)/lib @OPENCL_FLAGS@ @LIBCURL_CFLAGS@
+cgminer_CPPFLAGS = -I$(top_builddir)/lib -I$(top_srcdir)/lib @OPENCL_FLAGS@ @LIBUSB_CFLAGS@ @LIBCURL_CFLAGS@
 endif
 
 # common sources

configure.ac

@@ -62,8 +62,6 @@ AC_FUNC_ALLOCA
 
 have_win32=false
 PTHREAD_FLAGS="-lpthread"
-USB_LIBS=""
-USB_FLAGS=""
 DLOPEN_FLAGS="-ldl"
 OPENCL_LIBS="-lOpenCL"
 WS2_LIBS=""
@@ -343,15 +341,17 @@ if test "x$bitforce$modminer" != xnono; then
 fi
 AM_CONDITIONAL([HAVE_LIBUDEV], [test x$libudev != xno])
 
+PKG_PROG_PKG_CONFIG()
+
 if test "x$ztex" != xno; then
-  AC_CHECK_LIB(usb-1.0, libusb_init, ,
-          AC_MSG_ERROR([Could not find usb library - please install libusb]))
-  AC_DEFINE([HAVE_LIBUSB], [1], [Defined to 1 if libusb is wanted])
-  USB_LIBS="-lusb-1.0"
-  USB_FLAGS=""
+  case $target in
+    *)
+      PKG_CHECK_MODULES(LIBUSB, libusb-1.0, [AC_DEFINE(HAVE_LIBUSB, 1, [Define if you have libusb-1.0])], [AC_MSG_ERROR([Could not find usb library - please install libusb-1.0])])
+      ;;
+  esac
 fi
-
-PKG_PROG_PKG_CONFIG()
+AC_SUBST(LIBUSB_LIBS)
+AC_SUBST(LIBUSB_CFLAGS)
 
 PKG_CHECK_MODULES([LIBCURL], [libcurl >= 7.18.2], ,[AC_MSG_ERROR([Missing required libcurl dev >= 7.18.2])])
 AC_SUBST(LIBCURL_LIBS)
@@ -412,8 +412,6 @@ AC_SUBST(PDCURSES_LIBS)
 AC_SUBST(WS2_LIBS)
 AC_SUBST(MATH_LIBS)
 AC_SUBST(UDEV_LIBS)
-AC_SUBST(USB_LIBS)
-AC_SUBST(USB_FLAGS)
 
 AC_CONFIG_FILES([
 	Makefile
@@ -512,9 +510,9 @@ fi
 echo
 echo "Compilation............: make (or gmake)"
 echo "  CPPFLAGS.............: $CPPFLAGS"
-echo "  CFLAGS...............: $CFLAGS"
-echo "  LDFLAGS..............: $LDFLAGS $PTHREAD_FLAGS $USB_FLAGS"
-echo "  LDADD................: $DLOPEN_FLAGS $LIBCURL_LIBS $JANSSON_LIBS $PTHREAD_LIBS $OPENCL_LIBS $NCURSES_LIBS $PDCURSES_LIBS $WS2_LIBS $MATH_LIBS $UDEV_LIBS $USB_LIBS"
+echo "  CFLAGS...............: $CFLAGS $LIBUSB_CFLAGS"
+echo "  LDFLAGS..............: $LDFLAGS $PTHREAD_FLAGS"
+echo "  LDADD................: $DLOPEN_FLAGS $LIBCURL_LIBS $JANSSON_LIBS $PTHREAD_LIBS $OPENCL_LIBS $NCURSES_LIBS $PDCURSES_LIBS $WS2_LIBS $MATH_LIBS $UDEV_LIBS $LIBUSB_LIBS"
 echo
 echo "Installation...........: make install (as root if needed, with 'su' or 'sudo')"
 echo "  prefix...............: $prefix"

libztex.h

@@ -22,7 +22,7 @@
 #ifndef __LIBZTEX_H__
 #define __LIBZTEX_H__
 
-#include <libusb-1.0/libusb.h>
+#include <libusb.h>
 
 #define LIBZTEX_MAX_DESCRIPTORS 512
 #define LIBZTEX_SNSTRING_LEN 10

miner.h

@@ -103,7 +103,7 @@ static inline int fsync (int fd)
 #endif
 
 #ifdef HAVE_LIBUSB
-  #include <libusb-1.0/libusb.h>
+  #include <libusb.h>
 #endif
 
 #ifdef USE_ZTEX