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Hi,there
I got a problem.
when i ran the example " mesh_a_3d_gray_image.cpp" in Surface_mesher, it gave
me error messages.See the log:

[root@localhost
 examples]# cd Surface_mesher
[root@localhost
 Surface_mesher]# ls
CMakeLists.txt  data  mesh_a_3d_gray_image.cpp  mesh_an_implicit_function.cpp 
skip_vcproj_auto_generation
[root@localhost
 Surface_mesher]# cmake CMakeLists.txt
-- The C compiler identification is GNU
-- The CXX compiler identification is GNU
-- Check for working C compiler: /usr/bin/gcc
-- Check for working C compiler: /usr/bin/gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Build type: Release
-- USING CXXFLAGS = ' -frounding-math -O3 -DNDEBUG'
-- USING EXEFLAGS = ' '
-- Targetting Unix Makefiles
-- Using /usr/bin/c++ compiler.
-- Configuring done
-- Generating done
-- Build files have been written to: 
/root/src/CGAL-3.5/examples/Surface_mesher

[root@localhost
 Surface_mesher]# make
Scanning dependencies of target mesh_a_3d_gray_image
[ 50%] Building CXX object
CMakeFiles/mesh_a_3d_gray_image.dir/mesh_a_3d_gray_image.o
Linking CXX executable mesh_a_3d_gray_image
[ 50%] Built target mesh_a_3d_gray_image
Scanning dependencies of target mesh_an_implicit_function
[100%] Building CXX object
CMakeFiles/mesh_an_implicit_function.dir/mesh_an_implicit_function.o
Linking CXX executable mesh_an_implicit_function
[100%] Built target mesh_an_implicit_function
[root@localhost
 Surface_mesher]# ls
CMakeCache.txt  cmake_install.cmake  data      mesh_a_3d_gray_image     
mesh_an_implicit_function      skip_vcproj_auto_generation
CMakeFiles      CMakeLists.txt       Makefile  mesh_a_3d_gray_image.cpp 
mesh_an_implicit_function.cpp

[root@localhost
 Surface_mesher]# ./mesh_a_3d_gray_image 
./mesh_a_3d_gray_image: symbol lookup error:
/usr/local/lib/libCGAL_ImageIO.so.4: undefined symbol: 

the file "/usr/local/lib/libCGAL_ImageIO.so.4" is existing in that location.

Thanks!