diff --git a/arg.patch b/bff4-arg.patch
similarity index 100%
rename from arg.patch
rename to bff4-arg.patch
diff --git a/bff4.c b/bff4.c
index 20ff1dd..70d543f 100644
--- a/bff4.c
+++ b/bff4.c
@@ -6,11 +6,11 @@
  program have to be separated with ! e.g. ",.!a" prints 'a'
  To use it in interactive mode paste your program as input.
 
- This program can be compiled with LNR macro defined.
- LNR is another optimization of linear loops (where '<>' balanced), e.g. [->+>++<<].
+ This program can be compiled with NOLNR macro defined.
+ NOLNR disables optimization of linear loops (where '<>' balanced), e.g. [->+>++<<].
  Linear loop is then executed in one step.
 
- Oleg Mazonka 4.12.06  http://mazonka.com/
+ Oleg Mazonka 4 Dec 2006  http://mazonka.com/
 
  */
 
@@ -134,7 +134,7 @@ int main()
 		if( a==']' ) 
 		{
 			int l=1, i=sz;
-			while(l&&i>=0){ i--;l+=(o[i].c==']')-(o[i].c=='['); }
+			while(l&&i>=0) if(i--) l+=(o[i].c==']')-(o[i].c=='[');
 			if( i<0 ){ printf("unbalanced ']'\n"); exit(1); }
 			o[i].igo = sz;
 			o[sz].igo = i;
@@ -145,7 +145,7 @@ int main()
 	for( i=0;i<sz;i++ )
 	{
 	 	o[i].go = &o[o[i].igo];
-#ifdef LNR
+#ifndef NOLNR
 		if( o[i].c == '[' && o[i].igo == i+1 && o[i].shift==0 && o[i].off <= 0 )	
 		{
 			o[i].linear = -o[i].d[-o[i].off];
@@ -198,7 +198,7 @@ int main()
 			}
 
 
-#ifdef LNR
+#ifndef NOLNR
 			if( z->linear )
 			{
 				int del = m[mp]/z->linear;
diff --git a/bff4.changes b/bff4.changes
index 43e67c5..015f042 100644
--- a/bff4.changes
+++ b/bff4.changes
@@ -1,3 +1,12 @@
+-------------------------------------------------------------------
+Tue Jun 19 12:31:02 UTC 2012 - adam@mizerski.pl
+
+- added license-clarification.txt (bnc#761551) and updated
+  license tag
+- updated bff4.c
+- renamed arg.patch -> bff4-arg.patch and added patch info
+- improved and cleaned-up spec file
+
 -------------------------------------------------------------------
 Sat Sep 17 19:28:53 UTC 2011 - jengelh@medozas.de
 
diff --git a/bff4.spec b/bff4.spec
index b546850..35378b5 100644
--- a/bff4.spec
+++ b/bff4.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package bff4
 #
-# Copyright (c) 2011 SUSE LINUX Products GmbH, Nuernberg, Germany.
+# Copyright (c) 2012 SUSE LINUX Products GmbH, Nuernberg, Germany.
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -16,17 +16,18 @@
 #
 
 
-
 Name:           bff4
 Version:        1
-Release:        1
-License:        OSI_COMPLIANT_FREE(Public domain)
-Source0:        %{name}.c
-Patch0:         arg.patch
-Group:          Development/Languages/Other
+Release:        0
 Summary:        Fast Brainfuck interpreter
+License:        SUSE-Public-Domain
+Group:          Development/Languages/Other
 Url:            http://mazonka.com/brainf/
-
+Source0:        %{name}.c
+# bnc#761551
+Source1:        license-clarification.txt
+# PATCH-FEATURE-OPENSUSE bff4-arg.patch adam@mizerski.pl -- add option to pass input file as command line argument
+Patch0:         %{name}-arg.patch
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 
 %description
@@ -34,25 +35,23 @@ Optimizing brainfuck implementation of dialect based on Daniel's dbfi (see "A ve
 
 This interpreter has only one input: program and input to the program have to be separated with ! e.g. ",.!a" prints 'a' To use it in interactive mode paste your program as input.
 
-This program can be compiled with LNR macro defined. LNR is another optimization of linear loops (where '<>' balanced), e.g. [->+>++<<]. Linear loop is then executed in one step.
+This program is compiled with optimization of linear loops (where '<>' balanced), e.g. [->+>++<<]. Linear loop is then executed in one step.
 
 Oleg Mazonka 4.12.06  http://mazonka.com/
 
 %prep
-%__cp %{SOURCE0} .
+cp %{SOURCE0} %{SOURCE1} .
 %patch0
 
 %build
-gcc %{SOURCE0} -o %{name} %optflags
-gcc %{SOURCE0} -DLNR -o %{name}lnr %optflags
+gcc %{name}.c -o %{name} %{optflags}
 
 %install
-%__install -D -m 755 %{name} %buildroot%{_bindir}/%{name}
-%__install -D -m 755 %{name}lnr %buildroot%{_bindir}/%{name}lnr
+install -D -m 755 %{name} %{buildroot}%{_bindir}/%{name}
 
 %files
 %defattr(-,root,root)
 %{_bindir}/%{name}
-%{_bindir}/%{name}lnr
+%doc license-clarification.txt
 
 %changelog
diff --git a/license-clarification.txt b/license-clarification.txt
new file mode 100644
index 0000000..f2c91d8
--- /dev/null
+++ b/license-clarification.txt
@@ -0,0 +1,25 @@
+Hi Adam,
+
+You can use 'public domain' or another the least restrictive license.
+
+Cheers,
+- Oleg
+
+-----Original Message-----
+From: Adam Mizerski [mailto:adam@mizerski.pl]
+Sent: Sunday, 24 January 2010 7:35 AM
+To: mazonka@gmail.com
+Subject: question about bff4
+
+Hi.
+Your brainfuck interpreter is pretty cool, and I wanted to build it on
+openSuSE Build Service (http://en.opensuse.org/Build_Service). My
+question is:
+Under which license is source code of bff4 released?
+(GPL, BSD, or maybe something else...)
+
+It's needed to be written in package specification and I don't want to
+leave it blank, or to choose by myself.
+
+--
+Adam Mizerski