diff --git a/compileX11.sh b/compileX11.sh
index 403f517a..fe10596e 100755
--- a/compileX11.sh
+++ b/compileX11.sh
@@ -1,5 +1,14 @@
 #! /bin/bash
 
+cd ./compressed_archive
+if [ ! -d "libp7zip" ]; then
+echo "You need p7zip source code to compile YACReader. \
+Please check the compressed_archive folder for further instructions."
+exit
+fi
+patch -p0 -i libp7zip.patch
+cd ..
+
 echo "Compiling YACReader"
 cd ./YACReader
 qmake "CONFIG+=release"
diff --git a/compressed_archive/README_7zip.txt b/compressed_archive/README_7zip.txt
index 003e3f39..3e4a5864 100644
--- a/compressed_archive/README_7zip.txt
+++ b/compressed_archive/README_7zip.txt
@@ -1,5 +1,7 @@
 If you are trying to compile YACReader, you need to donwload de source code of 7zip (Windows) or p7zip (Linux/MacOSX).
 
-Please, extract it and rename the folder to lib7zip (Windows) or libp7zip (Linux/MacOSX), then copy it to $YACREADER_SRC/compressed_archive/ (this folder)
+Please, extract it and rename the folder to lib7zip (Windows) or libp7zip (Linux/MacOSX), then copy it to $YACREADER_SRC/compressed_archive/ (this 
+folder). If you are using a 64 bit Linux-System, please apply libp7zip.patch for successfull compilation or use compileX11.sh.
+
+YACReader is compiled using 7zip/p7zip 9.20.1
 
-YACReader is compiled using 7zip/p7zip 9.20.
\ No newline at end of file
diff --git a/compressed_archive/libp7zip.patch b/compressed_archive/libp7zip.patch
new file mode 100644
index 00000000..522c1202
--- /dev/null
+++ b/compressed_archive/libp7zip.patch
@@ -0,0 +1,11 @@
+--- libp7zip/CPP/myWindows/StdAfx.h	2014-06-06 23:52:13.397311952 +0200
++++ libp7zip/CPP/myWindows/StdAfx.h	2014-06-06 23:53:20.353981756 +0200
+@@ -114,7 +114,7 @@
+ 
+ #if defined( __x86_64__ )
+ 
+-#define _WIN64 1
++//#define _WIN64 1
+ 
+ #endif
+