+# GPIB backend is only compiled in if libgpib headers found.
+PKG_CHECK_MODULES([libgpib], [libgpib],
+ [have_libgpib="yes"; LIB_CFLAGS="$LIB_CFLAGS $libgpib_CFLAGS";
+ LIBS="$LIBS $libgpib_LIBS";
+ SR_PKGLIBS="$SR_PKGLIBS libgpib"],
+ [have_libgpib="no"])
+AM_CONDITIONAL(NEED_GPIB, test "x$have_libgpib" != xno)
+
+# Define HAVE_LIBGPIB in config.h if we found libgpib.
+if test "x$have_libgpib" != "xno"; then
+ AC_DEFINE_UNQUOTED(HAVE_LIBGPIB, [1],
+ [Specifies whether we have libgpib.])
+fi
+