diff -urEb dcmtk-3.6.2.orig/CMake/GenerateDCMTKConfigure.cmake dcmtk-3.6.2/CMake/GenerateDCMTKConfigure.cmake
--- dcmtk-3.6.2.orig/CMake/GenerateDCMTKConfigure.cmake	2020-01-06 17:42:52.299540389 +0100
+++ dcmtk-3.6.2/CMake/GenerateDCMTKConfigure.cmake	2020-01-06 17:43:56.707520036 +0100
@@ -568,12 +568,12 @@
   ENDIF(HAVE_CSTDDEF)
 
   CHECK_FUNCTIONWITHHEADER_EXISTS(feenableexcept "${HEADERS}" HAVE_PROTOTYPE_FEENABLEEXCEPT)
-  CHECK_FUNCTIONWITHHEADER_EXISTS(isinf "${HEADERS}" HAVE_PROTOTYPE_ISINF)
-  CHECK_FUNCTIONWITHHEADER_EXISTS(isnan "${HEADERS}" HAVE_PROTOTYPE_ISNAN)
-  CHECK_FUNCTIONWITHHEADER_EXISTS(finite "${HEADERS}" HAVE_PROTOTYPE_FINITE)
-  CHECK_FUNCTIONWITHHEADER_EXISTS(std::isinf "${HEADERS}" HAVE_PROTOTYPE_STD__ISINF)
-  CHECK_FUNCTIONWITHHEADER_EXISTS(std::isnan "${HEADERS}" HAVE_PROTOTYPE_STD__ISNAN)
-  CHECK_FUNCTIONWITHHEADER_EXISTS(std::finite "${HEADERS}" HAVE_PROTOTYPE_STD__FINITE)
+  CHECK_FUNCTIONWITHHEADER_EXISTS("isinf(0.)" "${HEADERS}" HAVE_PROTOTYPE_ISINF)
+  CHECK_FUNCTIONWITHHEADER_EXISTS("isnan(0.)" "${HEADERS}" HAVE_PROTOTYPE_ISNAN)
+  CHECK_FUNCTIONWITHHEADER_EXISTS("finite(0.)" "${HEADERS}" HAVE_PROTOTYPE_FINITE)
+  CHECK_FUNCTIONWITHHEADER_EXISTS("std::isinf(0.)" "${HEADERS}" HAVE_PROTOTYPE_STD__ISINF)
+  CHECK_FUNCTIONWITHHEADER_EXISTS("std::isnan(0.)" "${HEADERS}" HAVE_PROTOTYPE_STD__ISNAN)
+  CHECK_FUNCTIONWITHHEADER_EXISTS("std::finite(0.)" "${HEADERS}" HAVE_PROTOTYPE_STD__FINITE)
   CHECK_FUNCTIONWITHHEADER_EXISTS(flock "${HEADERS}" HAVE_PROTOTYPE_FLOCK)
   CHECK_FUNCTIONWITHHEADER_EXISTS(gethostbyname "${HEADERS}" HAVE_PROTOTYPE_GETHOSTBYNAME)
   CHECK_FUNCTIONWITHHEADER_EXISTS(gethostbyname_r "${HEADERS}" HAVE_PROTOTYPE_GETHOSTBYNAME_R)
diff -urEb dcmtk-3.6.2.orig/dcmdata/include/dcmtk/dcmdata/dcdict.h dcmtk-3.6.2/dcmdata/include/dcmtk/dcmdata/dcdict.h
--- dcmtk-3.6.2.orig/dcmdata/include/dcmtk/dcmdata/dcdict.h	2020-01-06 17:42:52.283540394 +0100
+++ dcmtk-3.6.2/dcmdata/include/dcmtk/dcmdata/dcdict.h	2020-01-06 17:46:21.711473976 +0100
@@ -152,6 +152,12 @@
     /// returns an iterator to the end of the repeating tag dictionary
     DcmDictEntryListIterator repeatingEnd() { return repDict.end(); }
 
+    // Function by the Orthanc project to load a dictionary from a
+    // memory buffer, which is necessary in sandboxed
+    // environments. This is an adapted version of
+    // DcmDataDictionary::loadDictionary().
+    OFBool loadFromMemory(const std::string& content, OFBool errorIfAbsent = OFTrue);
+
 private:
 
     /** private undefined assignment operator
diff -urEb dcmtk-3.6.2.orig/dcmdata/libsrc/dcdict.cc dcmtk-3.6.2/dcmdata/libsrc/dcdict.cc
--- dcmtk-3.6.2.orig/dcmdata/libsrc/dcdict.cc	2020-01-06 17:42:52.287540392 +0100
+++ dcmtk-3.6.2/dcmdata/libsrc/dcdict.cc	2020-01-06 17:47:18.335299472 +0100
@@ -876,3 +876,6 @@
   wrlock().clear();
   unlock();
 }
+
+
+#include "dcdict_orthanc.cc"