When compiling DCMTK 3.5.3 with gcc I get compiler errors like'xmlSchemaParserCtxtPtr' undeclared (first use this function),
'xmlSchemaSetParserErrors' undeclared (first use this function) etc.
The libxml2 library on your system has been compiled without XML Schema support. You should either switch off support for libxml2 (using "configure --without-libxml") and recompile DCMTK or replace the libxml2 library.This issue will be fixed with the next DCMTK release (3.5.4).