diff --git a/Build.md b/Build.md
index f48f50495..d8e6c50f6 100644
--- a/Build.md
+++ b/Build.md
@@ -14,7 +14,7 @@ The assimp port in vcpkg is kept up to date by Microsoft team members and commun
 ## Install on Ubuntu
 You can install the Asset-Importer-Lib via apt:
 ```
-sudp apt-get update
+sudo apt-get update
 sudo apt-get install libassimp-dev
 ```
 
diff --git a/code/AssetLib/3MF/D3MFOpcPackage.cpp b/code/AssetLib/3MF/D3MFOpcPackage.cpp
index f88039ae8..a2182dc29 100644
--- a/code/AssetLib/3MF/D3MFOpcPackage.cpp
+++ b/code/AssetLib/3MF/D3MFOpcPackage.cpp
@@ -186,6 +186,9 @@ D3MFOpcPackage::D3MFOpcPackage(IOSystem *pIOHandler, const std::string &rFile) :
 D3MFOpcPackage::~D3MFOpcPackage() {
     mZipArchive->Close(mRootStream);
     delete mZipArchive;
+    for (auto tex : mEmbeddedTextures) {
+        delete tex;
+    }
 }
 
 IOStream *D3MFOpcPackage::RootStream() const {
diff --git a/code/Common/ZipArchiveIOSystem.cpp b/code/Common/ZipArchiveIOSystem.cpp
index e0c9883d2..a29380838 100644
--- a/code/Common/ZipArchiveIOSystem.cpp
+++ b/code/Common/ZipArchiveIOSystem.cpp
@@ -196,7 +196,9 @@ zlib_filefunc_def IOSystem2Unzip::get(IOSystem *pIOHandler) {
     zlib_filefunc_def mapping;
 
     mapping.zopen_file = (open_file_func)open;
+#ifdef _UNZ_H
     mapping.zopendisk_file = (opendisk_file_func)opendisk;
+#endif
     mapping.zread_file = (read_file_func)read;
     mapping.zwrite_file = (write_file_func)write;
     mapping.ztell_file = (tell_file_func)tell;