diff --git a/src/3rdParty/libE57Format/src/CompressedVectorReaderImpl.cpp b/src/3rdParty/libE57Format/src/CompressedVectorReaderImpl.cpp
index 60a62abde4..87fe47bae0 100644
--- a/src/3rdParty/libE57Format/src/CompressedVectorReaderImpl.cpp
+++ b/src/3rdParty/libE57Format/src/CompressedVectorReaderImpl.cpp
@@ -561,6 +561,7 @@ namespace e57
                                                         const char *srcFunctionName ) const
    {
       // unimplemented...
+      (void)srcFileName; (void)srcLineNumber; (void)srcFunctionName;
    }
 
    void CompressedVectorReaderImpl::checkReaderOpen( const char *srcFileName, int srcLineNumber,
diff --git a/src/3rdParty/libE57Format/src/CompressedVectorWriterImpl.cpp b/src/3rdParty/libE57Format/src/CompressedVectorWriterImpl.cpp
index f6bc42d4f3..7f5b30690e 100644
--- a/src/3rdParty/libE57Format/src/CompressedVectorWriterImpl.cpp
+++ b/src/3rdParty/libE57Format/src/CompressedVectorWriterImpl.cpp
@@ -601,6 +601,7 @@ namespace e57
                                                         const char *srcFunctionName ) const
    {
       // unimplemented...
+      (void)srcFileName; (void)srcLineNumber; (void)srcFunctionName;
    }
 
    void CompressedVectorWriterImpl::checkWriterOpen( const char *srcFileName, int srcLineNumber,
diff --git a/src/3rdParty/libE57Format/src/Decoder.cpp b/src/3rdParty/libE57Format/src/Decoder.cpp
index ffded8db3a..2c0f299e36 100644
--- a/src/3rdParty/libE57Format/src/Decoder.cpp
+++ b/src/3rdParty/libE57Format/src/Decoder.cpp
@@ -837,6 +837,7 @@ void ConstantIntegerDecoder::destBufferSetNew( std::vector<SourceDestBuffer> &db
 
 size_t ConstantIntegerDecoder::inputProcess( const char *source, const size_t availableByteCount )
 {
+   (void)source; (void)availableByteCount;
 #ifdef E57_MAX_VERBOSE
    std::cout << "ConstantIntegerDecoder::inputprocess() called, source=" << (void *)( source )
              << " availableByteCount=" << availableByteCount << std::endl;
diff --git a/src/3rdParty/libE57Format/src/E57XmlParser.cpp b/src/3rdParty/libE57Format/src/E57XmlParser.cpp
index 64de0229fd..ef60ab848a 100644
--- a/src/3rdParty/libE57Format/src/E57XmlParser.cpp
+++ b/src/3rdParty/libE57Format/src/E57XmlParser.cpp
@@ -835,6 +835,7 @@ void E57XmlParser::endElement( const XMLCh *const uri, const XMLCh *const localN
 
 void E57XmlParser::characters( const XMLCh *const chars, const XMLSize_t length )
 {
+   (void)length;
 //??? use length to make ustring
 #ifdef E57_MAX_VERBOSE
    std::cout << "characters, chars=\"" << toUString( chars ) << "\" length=" << length << std::endl;
diff --git a/src/3rdParty/libE57Format/src/Packet.cpp b/src/3rdParty/libE57Format/src/Packet.cpp
index c180d8c576..ecf9c48a35 100644
--- a/src/3rdParty/libE57Format/src/Packet.cpp
+++ b/src/3rdParty/libE57Format/src/Packet.cpp
@@ -163,6 +163,7 @@ std::unique_ptr<PacketLock> PacketReadCache::lock( uint64_t packetLogicalOffset,
 
 void PacketReadCache::unlock( unsigned cacheIndex )
 {
+   (void)cacheIndex;
    //??? why lockedEntry not used?
 #ifdef E57_MAX_VERBOSE
    std::cout << "PacketReadCache::unlock() called, cacheIndex=" << cacheIndex << std::endl;
@@ -543,6 +544,7 @@ void DataPacket::dump( int indent, std::ostream &os ) const
 
 void IndexPacket::verify( unsigned bufferLength, uint64_t totalRecordCount, uint64_t fileSize ) const
 {
+   (void)totalRecordCount; (void)fileSize;
    //??? do all packets need versions?  how extend without breaking older
    // checking?  need to check
    // file version#?