likscan: Prefer pkg-config for libsane detection

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

libkscan/ConfigureChecks.cmake

@@ -9,17 +9,20 @@
 #
 #################################################
 
-if( NOT HAVE_SANE )
+if( NOT SANE_FOUND )
-  message( STATUS "checking for 'sane'..." )
+  pkg_search_module( SANE sane-backends )
 endif( )
 
-# find sane-config
+if( NOT SANE_FOUND )
-find_program( SANE_EXECUTABLE NAMES sane-config )
+  message( STATUS "checking for 'sane'..." )
-if( NOT SANE_EXECUTABLE )
+
+  # find sane-config
+  find_program( SANE_EXECUTABLE NAMES sane-config )
+  if( NOT SANE_EXECUTABLE )
     tde_message_fatal( "sane-config is NOT found.\n sane library is installed?" )
-endif( )
+  endif( )
 
-macro( __run_sane_config  __type __var )
+  macro( __run_sane_config  __type __var )
     execute_process(
       COMMAND ${SANE_EXECUTABLE} --${__type}
       OUTPUT_VARIABLE ${__var}
@@ -28,17 +31,19 @@ macro( __run_sane_config  __type __var )
     if( _result )
       tde_message_fatal( "Unable to run ${SANE_EXECUTABLE}!\n sane library is correctly installed?\n Path to sane-config is corect?" )
     endif( )
-endmacro( )
+  endmacro( )
 
-__run_sane_config( version SANE_VERSION )
+  __run_sane_config( version SANE_VERSION )
-__run_sane_config( cflags SANE_INCLUDE_DIRS )
+  __run_sane_config( cflags SANE_INCLUDE_DIRS )
-__run_sane_config( libs SANE_LIBRARIES )
+  __run_sane_config( libs SANE_LIBRARIES )
 
-# cleanup
+  # cleanup
-if( SANE_INCLUDE_DIRS )
+  if( SANE_INCLUDE_DIRS )
     string( REGEX REPLACE "(^| )-I" ";" SANE_INCLUDE_DIRS "${SANE_INCLUDE_DIRS}" )
-endif( )
+  else( )
-if( SANE_LIBRARIES )
+    set( SANE_INCLUDE_DIRS "/usr/include" )
+  endif( )
+  if( SANE_LIBRARIES )
     ## remove all spaces and replace whitespace with ';'
     string( REGEX REPLACE "[ ]+" ";" SANE_LIBRARIES "${SANE_LIBRARIES}" )
     ## remove all non-library information
@@ -47,8 +52,11 @@ if( SANE_LIBRARIES )
     string( REGEX REPLACE "[;]+" ";" SANE_LIBRARIES "${SANE_LIBRARIES}" )
     ## remove '-l'
     string( REGEX REPLACE "-l" "" SANE_LIBRARIES "${SANE_LIBRARIES}" )
-endif( )
+  endif( )
-
-if( NOT HAVE_SANE )
   message( STATUS "  found 'sane', version ${SANE_VERSION}" )
+
+  include(FindPackageHandleStandardArgs)
+  find_package_handle_standard_args( SANE DEFAULT_MSG
+                                     SANE_LIBRARIES
+                                     SANE_INCLUDE_DIRS )
 endif( )