From Gino van den Bergen, "The FindGDAL.cmake seems to be broken in OSG 2.6.1 for locating gdal.h through enviroment variable GDAL_DIR.

Also, I've modified the FindCOLLADA.cmake to locate the current 2.1 versions of the COLLADA DOM in the build directories under VC8. I've also added a COLLADA_LIBRARY_DEBUG spec. Other flavors may be added depending on compiler version and DOM version."

CMakeModules/FindGDAL.cmake

@@ -20,6 +20,7 @@
 # #include "gdal.h"
 
 FIND_PATH(GDAL_INCLUDE_DIR gdal.h
+  PATHS
   $ENV{GDAL_DIR}
   NO_DEFAULT_PATH
     PATH_SUFFIXES include