Added FindGnuBarcode cmake module.

cmake/Modules/FindGnuBarcode.cmake

@@ -0,0 +1,27 @@
+# - Try to find the GNU Barcode library
+# Once done this will define
+#
+#  GNUBARCODE_FOUND - System has GNU Barcode
+#  GNUBARCODE_INCLUDE_DIR - The GNU Barcode include directory
+#  GNUBARCODE_LIBRARIES - The libraries needed to use GNU Barcode
+#  GNUBARCODE_VERSION_STRING - the version of GNU Barcode found
+
+set (GNUBARCODE_DEFINITIONS "")
+
+find_path (GNUBARCODE_INCLUDE_DIR NAMES barcode.h PATH_SUFFIXES barcode)
+
+find_library (GNUBARCODE_LIBRARIES NAMES barcode )
+
+if (GNUBARCODE_INCLUDE_DIR AND EXISTS "${GNUBARCODE_INCLUDE_DIR}/barcode.h")
+  file (STRINGS "${GNUBARCODE_INCLUDE_DIR}/barcode.h" BARCODE_H REGEX "^#define BARCODE_VERSION *\"[^\"]*\"")
+  string (REGEX REPLACE "^.*VERSION *\"([^\"]*)\"" "\\1" GNUBARCODE_VERSION_STRING ${BARCODE_H})
+endif()
+
+# handle the QUIETLY and REQUIRED arguments and set GNUBARCODE_FOUND to TRUE if
+# all listed variables are TRUE
+include(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(GnuBarcode
+                                  REQUIRED_VARS GNUBARCODE_LIBRARIES GNUBARCODE_INCLUDE_DIR
+                                  VERSION_VAR GNUBARCODE_VERSION_STRING)
+
+mark_as_advanced(GNUBARCODE_INCLUDE_DIR GNUBARCODE_LIBRARIES)