diff --git a/code/cgame/cg_syscalls.c b/code/cgame/cg_syscalls.c
index 3c1efa04..a03068e7 100644
--- a/code/cgame/cg_syscalls.c
+++ b/code/cgame/cg_syscalls.c
@@ -28,10 +28,10 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
 #include "cg_local.h"
 
-static long (QDECL *syscall)( int arg, ... ) = (long (QDECL *)( int, ...))-1;
+static long (QDECL *syscall)( long arg, ... ) = (long (QDECL *)( long, ...))-1;
 
 
-void dllEntry( long (QDECL  *syscallptr)( int arg,... ) ) {
+void dllEntry( long (QDECL  *syscallptr)( long arg,... ) ) {
 	syscall = syscallptr;
 }
 
diff --git a/code/game/g_syscalls.c b/code/game/g_syscalls.c
index 0e7c8cd3..256a1c8a 100644
--- a/code/game/g_syscalls.c
+++ b/code/game/g_syscalls.c
@@ -28,10 +28,10 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 #error "Do not use in VM build"
 #endif
 
-static int (QDECL *syscall)( int arg, ... ) = (int (QDECL *)( int, ...))-1;
+static long (QDECL *syscall)( long arg, ... ) = (long (QDECL *)( long, ...))-1;
 
 
-void dllEntry( int (QDECL *syscallptr)( int arg,... ) ) {
+void dllEntry( long (QDECL *syscallptr)( long arg,... ) ) {
 	syscall = syscallptr;
 }
 
diff --git a/code/qcommon/vm.c b/code/qcommon/vm.c
index 713e6aee..87f07952 100644
--- a/code/qcommon/vm.c
+++ b/code/qcommon/vm.c
@@ -716,8 +716,10 @@ long	QDECL VM_Call( vm_t *vm, long callnum, ... ) {
                             args[4],  args[5],  args[6], args[7],
                             args[8],  args[9], args[10], args[11],
                             args[12], args[13], args[14], args[15]);
+#if defined(HAVE_VM_COMPILED)
 	} else if ( vm->compiled ) {
 		r = VM_CallCompiled( vm, &callnum );
+#endif
 	} else {
 		struct {
 			int callnum;
diff --git a/code/ui/ui_syscalls.c b/code/ui/ui_syscalls.c
index 7240c2b2..2ed67123 100644
--- a/code/ui/ui_syscalls.c
+++ b/code/ui/ui_syscalls.c
@@ -28,9 +28,9 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 #error "Do not use in VM build"
 #endif
 
-static int (QDECL *syscall)( int arg, ... ) = (int (QDECL *)( int, ...))-1;
+static long (QDECL *syscall)( long arg, ... ) = (long (QDECL *)( long, ...))-1;
 
-void dllEntry( int (QDECL *syscallptr)( int arg,... ) ) {
+void dllEntry( long (QDECL *syscallptr)( long arg,... ) ) {
 	syscall = syscallptr;
 }
 
diff --git a/i_o-q3-readme b/i_o-q3-readme
index 22d23b12..bf7d5001 100644
--- a/i_o-q3-readme
+++ b/i_o-q3-readme
@@ -12,3 +12,22 @@ http://www.qeradiant.com/
 
 cd code/unix && make
 Refer to the web-site for updated status, enjoy!
+
+Using shared libraries instead of qvm
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+To make quake3 prefer shared libraries instead of qvm run it with
+the following parameters:
++set sv_pure 0 +set vm_cgame 0 +set vm_game 0 +set vm_ui 0
+
+Using Demo Data Files
+~~~~~~~~~~~~~~~~~~~~~
+you only need demoq3/pak0.pk3 from the demo installer. The qvm files inside
+pak0.pk3 will not work, you have to use the native shared libraries from this
+project. To do so copy or link ui*.so, qagame*.so, cgame*.so from baseq3 to
+demoq3 and run quake3 with the parameters described above.
+
+64bit mods
+~~~~~~~~~~
+To compile working(!) shared libraries for 64bit mods the vmMain and
+dllEntry functions as well as the syscall pointer have to be changed
+to accept and return long instead of int.