vcpkg/ports/osgearth/fix-osgearth-config.patch

diff --git a/osgEarthConfig.cmake.in b/osgEarthConfig.cmake.in
index 3f27dffe9..354e0f7dc 100644
--- a/osgEarthConfig.cmake.in
+++ b/osgEarthConfig.cmake.in
@@ -13,11 +13,11 @@ endif()
 set(osgearth_DEFINITIONS ${${XPREFIX}_CFLAGS})
 
 find_path(osgearth_INCLUDE_DIR
-    NAMES OSGEARTH/RTREE.H
+    NAMES osgEarth/rtree.h
     HINTS ${${XPREFIX}_INCLUDE_DIRS}
 )
 
-set(OSGEARTH_NAMES osgearth)
+set(OSGEARTH_NAMES osgEarth)
 
 find_library(osgearth_LIBRARY
     NAMES ${OSGEARTH_NAMES}
@@ -38,6 +38,8 @@ find_package_handle_standard_args(osgearth DEFAULT_MSG
 
 string (REPLACE ";" " " osgearth_LDFLAGS "${osgearth_LDFLAGS}")
 
+add_library(osgEarth UNKNOWN IMPORTED)
+
 set_target_properties(osgearth
   PROPERTIES
   IMPORTED_LOCATION             "${osgearth_LIBRARIES}"