Index: toltcl/cmake/modules/FindTOL.cmake
===================================================================
--- toltcl/cmake/modules/FindTOL.cmake	(revision b6e5dacc5786bd372a7967ec32a4af84e34be88e)
+++ toltcl/cmake/modules/FindTOL.cmake	(revision ed3716eedfe8f33f3618ae9e25b12ff9c3560291)
@@ -14,6 +14,9 @@
 set( TOL_FOUND 0 )
 
-if( EXISTS ${TOL_PREFIX_PATH} )
-
+if( DEFINED TOL_PREFIX_PATH )
+  if( NOT IS_ABSOLUTE ${TOL_PREFIX_PATH} )
+    file( TO_CMAKE_PATH "${CMAKE_CURRENT_BINARY_DIR}/${TOL_PREFIX_PATH}" TOL_PREFIX_PATH )
+    get_filename_component( TOL_PREFIX_PATH ${TOL_PREFIX_PATH} ABSOLUTE )
+  endif()
   #find includes
   find_path(
@@ -28,5 +31,5 @@
     PATH_SUFFIXES "lib"
     NO_DEFAULT_PATH )
-else(  EXISTS ${TOL_PREFIX_PATH} )
+else( DEFINED TOL_PREFIX_PATH )
 
   #find includes
@@ -36,5 +39,5 @@
   find_library( TOL_LIBRARY
     NAMES tol )
-endif( EXISTS ${TOL_PREFIX_PATH} )
+endif( DEFINED TOL_PREFIX_PATH )
 
 set( TOL_PROCESS_INCLUDES TOL_INCLUDE_DIR )