COMP: /usr/include is always searched by cmake

CMake/ImportGdal.cmake

@@ -72,7 +72,7 @@ IF(OTB_USE_EXTERNAL_GDAL)
   ENDIF (NOT GEOTIFF_INCLUDE_DIRS)
 
   # Find tiff headers
-  FIND_PATH(TIFF_INCLUDE_DIRS tiffio.h ${GDAL_INCLUDE_DIR} /usr/include)
+  FIND_PATH(TIFF_INCLUDE_DIRS tiffio.h ${GDAL_INCLUDE_DIR})
   MARK_AS_ADVANCED(TIFF_INCLUDE_DIRS)
   IF (NOT TIFF_INCLUDE_DIRS)
   MESSAGE(FATAL_ERROR
@@ -80,7 +80,7 @@ IF(OTB_USE_EXTERNAL_GDAL)
   ENDIF (NOT TIFF_INCLUDE_DIRS)
 
   # Find jpeg headers
-  FIND_PATH(JPEG_INCLUDE_DIRS jpeglib.h ${GDAL_INCLUDE_DIR} /usr/include)
+  FIND_PATH(JPEG_INCLUDE_DIRS jpeglib.h ${GDAL_INCLUDE_DIR})
   MARK_AS_ADVANCED(JPEG_INCLUDE_DIRS)
   IF (NOT JPEG_INCLUDE_DIRS)
   MESSAGE(FATAL_ERROR
@@ -89,7 +89,7 @@ IF(OTB_USE_EXTERNAL_GDAL)
   INCLUDE_DIRECTORIES(${JPEG_INCLUDE_DIRS})
 
   # Find ogr headers
-  FIND_PATH(OGR_INCLUDE_DIRS ogrsf_frmts.h ${GDAL_INCLUDE_DIR} /usr/include)
+  FIND_PATH(OGR_INCLUDE_DIRS ogrsf_frmts.h ${GDAL_INCLUDE_DIR})
   MARK_AS_ADVANCED(OGR_INCLUDE_DIRS)
   IF (NOT OGR_INCLUDE_DIRS)
   MESSAGE(FATAL_ERROR