[Insight-users] unable to build itk without building zlib and png libs

[Brad King]

Brad King wrote:
> Gaetan Lehmann wrote:
> 
>> If we can't use ITK with system libs, perhap's ITK_USE_SYSTEM_PNG,  
>> ITK_USE_SYSTEM_TIFF, and ITK_USE_SYSTEM_ZLIB may be removed for the 
>> next  release :-)
> 
> 
> I think there has been some confusion here.  The option to use a system 
> library has been removed only for JPEG because ITK now has jpeg8, 
> jpeg12, and jpeg16 libraries that are all compiled specially (part of 
> recent GDCM changes).  The options for tiff, zlib, and png are still 
> supposed to work, and they are provided specifically for people trying 
> to create packages on systems like Linux.  I will investigate this 
> problem when I get a chance.

Okay, it looks like the SpatialObjects example was trying to link 
directly to itkzlib and itkpng.  I've fixed this to use 
${ITK_ZLIB_LIBRARIES} and ${ITK_PNG_LIBRARIES} instead, which will 
either reference itkzlib/itkpng or the system versions depending on the 
settings of ITK_USE_SYSTEM_ZLIB and ITK_USE_SYSTEM_PNG.  This should 
solve the problem.

-Brad