* don't build artnet_usb on windows

Author: nomis52

configure.in

@@ -10,6 +10,9 @@ AM_CONFIG_HEADER(config.h)
 # Checks for programs.
 AC_PROG_CC
 AC_PROG_INSTALL
+AC_PROG_LN_S
+AC_PROG_MAKE_SET
+AC_PROG_LIBTOOL
 
 # Checks for libraries.
 # FIXME: Replace `main' with a function in `-lncurses':
@@ -36,4 +39,38 @@ AC_FUNC_SELECT_ARGTYPES
 AC_TYPE_SIGNAL
 AC_CHECK_FUNCS([gettimeofday atexit ftime memset select strdup strerror])
 
+AC_MSG_CHECKING([operating system])
+case $host in
+*-linux*)
+  AC_DEFINE(OS_LINUX, [], [Linux backend])
+  AC_SUBST(OS_LINUX)
+  AC_MSG_RESULT([Linux])
+  backend="linux"
+  ;;
+*-darwin*)
+  AC_DEFINE(OS_DARWIN, [], [Darwin backend])
+  AC_SUBST(OS_DARWIN)
+  AC_MSG_RESULT([Darwin/MacOS X])
+  backend="darwin"
+  ;;
+*-mingw*)
+  AC_DEFINE(OS_WINDOWS, [], [Windows backend])
+  AC_SUBST(OS_WINDOWS)
+  AC_MSG_RESULT([Windows])
+  backend="windows"
+  ;;
+*-cygwin*)
+  AC_DEFINE(OS_WINDOWS, [], [Windows backend])
+  AC_SUBST(OS_WINDOWS)
+  AC_MSG_RESULT([Windows])
+  backend="windows"
+  ;;
+*)
+  AC_MSG_ERROR([unsupported operating system])
+esac
+
+AM_CONDITIONAL([OS_LINUX], [test "x$backend" = "xlinux"])
+AM_CONDITIONAL([OS_DARWIN], [test "x$backend" = "xdarwin"])
+AM_CONDITIONAL([OS_WINDOWS], [test "x$backend" = "xwindows"])
+
 AC_OUTPUT(Makefile src/Makefile)

src/Makefile.am

@@ -11,11 +11,14 @@ artnet_dmxmonitor_SOURCES = artnet-dmxmonitor.c
 artnet_dmxmonitor_LDADD = $(libartnet_LIBS) -lcurses
 endif
 
+if OS_LINUX
+ARTNET_USB = artnet_usb
+endif
 
-bin_PROGRAMS = artnet_usb artnet_discover artnet_flood_rx artnet_flood_tx \
+bin_PROGRAMS = artnet_discover artnet_flood_rx artnet_flood_tx \
                artnet_firmware_node artnet_firmware_server artnet_multiport \
                artnet_profile_tx artnet_profile_rx artnet_rdm_output \
-               artnet_setdmx $(NCURSES_PROGS)
+               artnet_setdmx $(NCURSES_PROGS) $(ARTNET_USB)
 
 artnet_usb_SOURCES = artnet-usb.c
 artnet_usb_LDADD = $(libartnet_LIBS) -lpthread