diff --git a/README.md b/README.md
index d8f46ba..074b3d9 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,9 @@
 # byaccj
 
+BYACC/J is an extension of the Berkeley v 1.8 YACC-compatible parser generator.
+Standard YACC takes a YACC source file, and generates one or more C files from it, which if compiled properly, will produce a LALR-grammar parser. This is useful for expression parsing, interactive command parsing, and file reading.
+Many megabytes of YACC code have been written over the years.
+
+This is the standard YACC tool that is in use every day to produce C/C++ parsers.
+I have added a "-J" flag which will cause BYACC to generate Java source code, instead. So there finally is a YACC for Java now!
+
diff --git a/byaccj-1.15-Makefile.patch b/byaccj-1.15-Makefile.patch
new file mode 100644
index 0000000..ef2fbe0
--- /dev/null
+++ b/byaccj-1.15-Makefile.patch
@@ -0,0 +1,22 @@
+--- src/Makefile	2008-11-24 09:41:02.000000000 +0100
++++ src/Makefile-gil	2010-02-16 16:07:48.000000000 +0100
+@@ -5,8 +5,8 @@
+ #################################################
+ 
+ CC      = gcc
+-CFLAGS  = -O -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -mmacosx-version-min=10.4
+-LDFLAGS = -static -arch ppc -isysroot /Developer/SDKs/MacOSX10.4u.sdk
++CFLAGS  = -O
++LDFLAGS = -static
+ TAR     = tar
+ GZIP    = gzip
+ VERS    = byaccj1.15
+@@ -75,7 +75,7 @@
+ 	$(CC) -c $(CFLAGS) $(INC) $< -o $@
+ 
+ yacc: $(OBJ)
+-	$(CC) -o yacc -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -mmacosx-version-min=10.4 $(OBJ)
++	$(CC) -o yacc $(OBJ)
+ 	@echo "done"
+ 
+ clean:
diff --git a/byaccj.spec b/byaccj.spec
new file mode 100644
index 0000000..e25d555
--- /dev/null
+++ b/byaccj.spec
@@ -0,0 +1,69 @@
+Name:          byaccj
+Version:       1.15
+Release:       3mamba
+Summary:       Parser Generator with Java Extension
+Group:         Development/Libraries
+Vendor:        openmamba
+Distribution:  openmamba
+Packager:      gil <puntogil@libero.it>
+URL:           http://byaccj.sourceforge.net/
+Source:        http://mesh.dl.sourceforge.net/sourceforge/byaccj/byaccj%{version}_src.tar.gz
+Patch0:        byaccj-1.15-Makefile.patch
+License:       Public Domain
+## AUTOBUILDREQ-BEGIN
+BuildRequires: glibc-devel
+## AUTOBUILDREQ-END
+BuildRoot:     %{_tmppath}/%{name}-%{version}-root
+
+%description
+BYACC/J is an extension of the Berkeley v 1.8 YACC-compatible parser generator.
+Standard YACC takes a YACC source file, and generates one or more C files from it, which if compiled properly, will produce a LALR-grammar parser. This is useful for expression parsing, interactive command parsing, and file reading.
+Many megabytes of YACC code have been written over the years.
+
+This is the standard YACC tool that is in use every day to produce C/C++ parsers.
+I have added a "-J" flag which will cause BYACC to generate Java source code, instead. So there finally is a YACC for Java now! 
+
+%prep
+%setup -q -n %{name}%{version}
+%patch0
+
+%build
+pushd src
+	make linux CFLAGS="%{optflags}"
+	
+popd
+
+sed -i 's/\r//g' docs/tf.y
+
+%install
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+
+mkdir -p %{buildroot}%{_bindir}
+install -m 755 src/yacc.linux %{buildroot}%{_bindir}/byaccj
+
+mkdir -p %{buildroot}%{_mandir}/man1
+install -m 644 docs/yacc.cat %{buildroot}%{_mandir}/man1/
+#install -m 644 src/yacc.1 %{buildroot}%{_mandir}/man1/yacc.1-byaccj.gz
+
+%clean
+[ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
+
+%files
+%defattr(-,root,root)
+%{_bindir}/byaccj
+%{_mandir}/man1/yacc.cat.gz
+#%{_mandir}/man1/yacc.1.gz
+%doc docs/* src/no_warranty src/new_features
+
+%changelog
+* Mon Dec 31 2012 Silvan Calarco <silvan.calarco@mambasoft.it> 1.15-3mamba
+- rebuilt in devel
+
+* Thu Apr 29 2010 gil <puntogil@libero.it> 1.15-2mamba
+- removed yacc.1.gz in conflicts with bison 2.4.1
+
+* Tue Feb 16 2010 gil <puntogil@libero.it> 1.15-1mamba
+- update to 1.15
+
+* Mon Mar 02 2009 gil <puntogil@libero.it> 1.14-1mamba
+- package created by autospec