Index: libgeotiff-1.7.1/CMakeLists.txt
===================================================================
--- libgeotiff-1.7.1.orig/CMakeLists.txt
+++ libgeotiff-1.7.1/CMakeLists.txt
@@ -163,22 +163,8 @@ IF(WITH_TIFF)
     pkg_check_modules(TIFF REQUIRED libtiff-4)
 
     IF(TIFF_FOUND)
-        # Confirm required API is available
-        INCLUDE(CheckFunctionExists)
         SET(CMAKE_REQUIRED_LIBRARIES ${TIFF_LIBRARIES})
 
-        CHECK_FUNCTION_EXISTS(TIFFOpen HAVE_TIFFOPEN)
-        IF(NOT HAVE_TIFFOPEN)
-            SET(TIFF_FOUND) # ReSET to NOT found for TIFF library
-            MESSAGE(FATAL_ERROR "Failed to link with libtiff - TIFFOpen function not found")
-        ENDIF()
-
-        CHECK_FUNCTION_EXISTS(TIFFMergeFieldInfo HAVE_TIFFMERGEFIELDINFO)
-        IF(NOT HAVE_TIFFMERGEFIELDINFO)
-            SET(TIFF_FOUND) # ReSET to NOT found for TIFF library
-            MESSAGE(FATAL_ERROR "Failed to link with libtiff - TIFFMergeFieldInfo function not found. libtiff 3.6.0 Beta or later required. Please upgrade or use an older version of libgeotiff")
-        ENDIF()
-
         INCLUDE_DIRECTORIES(${TIFF_INCLUDE_DIR})
         ADD_DEFINITIONS(-DHAVE_TIFF=1)
     ENDIF(TIFF_FOUND)
