diff --git a/YACReaderLibrary/YACReaderLibrary.pro b/YACReaderLibrary/YACReaderLibrary.pro
index b30f5d57..b33896f7 100644
--- a/YACReaderLibrary/YACReaderLibrary.pro
+++ b/YACReaderLibrary/YACReaderLibrary.pro
@@ -285,6 +285,7 @@ exists (../compressed_archive/libp7zip) {
         Please check the compressed_archive folder for further instructions.)
 }
 }
+}
 
 unix:!macx {
 #set install prefix if it's empty
diff --git a/YACReaderLibrary/library_creator.cpp b/YACReaderLibrary/library_creator.cpp
index 42e43271..8b5662f4 100644
--- a/YACReaderLibrary/library_creator.cpp
+++ b/YACReaderLibrary/library_creator.cpp
@@ -122,8 +122,8 @@ void LibraryCreator::processLibrary(const QString & source, const QString & targ
 void LibraryCreator::run()
 {
 	stopRunning = false;
-
-	//check for 7z lib
+#ifndef use_unarr
+//check for 7z lib
 #if defined Q_OS_UNIX && !defined Q_OS_MAC
     QLibrary *sevenzLib = new QLibrary(QString(LIBDIR)+"/p7zip/7z.so");
 #else
@@ -137,7 +137,7 @@ void LibraryCreator::run()
 		exit();
 	}
 	sevenzLib->deleteLater();
-
+#endif
 	if(_mode == CREATOR)
 	{
 		QLOG_INFO() << "Starting to create new library ( " << _source << "," << _target << ")";
diff --git a/YACReaderLibrary/main.cpp b/YACReaderLibrary/main.cpp
index a883151f..1233ffac 100644
--- a/YACReaderLibrary/main.cpp
+++ b/YACReaderLibrary/main.cpp
@@ -92,6 +92,7 @@ void logSystemAndConfig()
     QLOG_INFO() << "SO : Unknown";
 #endif
 
+#ifndef use_unarr
 #ifdef Q_OS_WIN
     if(QLibrary::isLibrary(QApplication::applicationDirPath()+"/utils/7z.dll"))
 #elif defined Q_OS_UNIX && !defined Q_OS_MAC
@@ -102,6 +103,9 @@ void logSystemAndConfig()
         QLOG_INFO() << "7z : found";
     else
         QLOG_ERROR() << "7z : not found";
+#else
+	QLOG_INFO() << "using unarr decompression backend";
+#endif
 #if defined Q_OS_UNIX && !defined Q_OS_MAC
     if(QFileInfo(QString(BINDIR)+"/qrencode").exists())
 #else
diff --git a/compressed_archive/unarr/unarr-wrapper.pri b/compressed_archive/unarr/unarr-wrapper.pri
index 4008abb7..2ba188c6 100644
--- a/compressed_archive/unarr/unarr-wrapper.pri
+++ b/compressed_archive/unarr/unarr-wrapper.pri
@@ -9,13 +9,16 @@ SOURCES += $$PWD/compressed_archive.cpp \
 unix:!macx:exists (/usr/include/unarr.h) {
 		message(Using system provided unarr installation)
 		LIBS+=-lunarr
+		DEFINES+=use_unarr
 		}
 else:macx:exists (../../dependencies/unarr/libunarr.dynlib) {
 		LIBS += -L../../dependencies/unarr/ -lunarr
+		DEFINES+=use_unarr
 		}
 
 else:win32:exists (../../dependencies/unarr/unarr.dll) {
 		LIBS += -L../../dependencies/unarr/ -lunarr
+		DEFINES+=use_unarr
 		}
 
 else:exists ($$PWD/unarr-master) {
@@ -25,6 +28,7 @@ else:exists ($$PWD/unarr-master) {
 		#qmake based unarr build system
 		#this should only be used for testing or as a last resort
 		include(unarr.pro)
+		DEFINES+=use_unarr
 		}
 	else {
 		error(Missing dependency: unarr decrompression backend. Please install libunarr on your system\