i'm trying to build dcmtk-3.6.6 using Cmake Gui https://github.com/DCMTK/dcmtk to convert a dcm file to Json, i faced the same problem in this link https://forum.dcmtk.org/viewtopic.php?t=4769 i can't enable the option DCMTK_ENABLE_CHARSET_CONVERSION in my cmake Gui (as you can see in the image, only disabled is show ) , i tried to build it with both DCMTK_WITH_CONV and DCMTK_WITH_ICU to be able to use convertToUTF8() but it seems that does not work 
we can see in the second image that DCMTK_ENABLE_CHARSET_CONVERSION Is not defined
Could someone help me ? thanks
EDIT : my cmakeGui log show that he didn't find ICU, so probably the problem are coming from me, how can i install ICU ?
