downgrade to Bison 1.35 but nevertheless provide the 1.50 version as bison-beta, similar to what we do with Flex.

bison/bison.spec

@@ -23,6 +23,15 @@
 ##  SUCH DAMAGE.
 ##
 
+#   package options
+%ifndef       with_beta
+%define       with_beta        yes
+%endif
+
+#   package versions
+%define       V_release        1.35
+%define       V_beta           1.50
+
 #   package information
 Name:         bison
 Summary:      Yacc-compatible LALR(1) Parser Generator
@@ -32,11 +41,12 @@ Packager:     The OpenPKG Project
 Distribution: OpenPKG [CORE]
 Group:        Language
 License:      GPL
-Version:      1.50
-Release:      20021008
+Version:      %{V_release}
+Release:      20021011
 
 #   list of sources
-Source0:      ftp://ftp.gnu.org/gnu/bison/bison-%{version}.tar.gz
+Source0:      ftp://ftp.gnu.org/gnu/bison/bison-%{V_release}.tar.gz
+Source1:      ftp://ftp.gnu.org/gnu/bison/bison-%{V_beta}.tar.gz
 Patch0:       bison.patch
 
 #   build information
@@ -57,25 +67,56 @@ AutoReqProv:  no
     with no change. Anyone familiar with yacc should be able to use bison with
     little trouble.
 
+    Options: 
+    --define 'with_beta %{with_beta}'
+
 %prep
-    %setup -q
-    %patch -p0
+    %setup0 -q -c -n bison-%{V_release}
+%if "%{with_beta}" == "yes"
+    %setup1 -q -T -D -a 1
+%endif
+    ( cd bison-%{V_beta}
+      %patch -p0
+    )
 
 %build
-    CC="%{l_cc}" \
-    CFLAGS="%{l_cflags -O}" \
-    CONFIG_SHELL=/bin/sh \
-    ./configure \
-        --prefix=%{l_prefix}
-    %{l_make} -f Makefile %{l_mflags}
+    ( cd bison-%{V_release}
+      CC="%{l_cc}" \
+      CFLAGS="%{l_cflags -O}" \
+      CONFIG_SHELL=/bin/sh \
+      ./configure \
+          --prefix=%{l_prefix}
+      %{l_make} -f Makefile %{l_mflags}
+    )
+%if "%{with_beta}" == "yes"
+    ( cd bison-%{V_beta}
+      CC="%{l_cc}" \
+      CFLAGS="%{l_cflags -O}" \
+      CONFIG_SHELL=/bin/sh \
+      ./configure \
+          --prefix=%{l_prefix}
+      %{l_make} -f Makefile %{l_mflags}
+    )
+%endif
 
 %install
     rm -rf $RPM_BUILD_ROOT
-    %{l_make} -f Makefile %{l_mflags} install AM_MAKEFLAGS="DESTDIR=$RPM_BUILD_ROOT"
-    strip $RPM_BUILD_ROOT%{l_prefix}/bin/* >/dev/null 2>&1 || true
+%if "%{with_beta}" == "yes"
+    ( cd bison-%{V_beta}
+      %{l_make} -f Makefile %{l_mflags} install AM_MAKEFLAGS="DESTDIR=$RPM_BUILD_ROOT"
+      mv $RPM_BUILD_ROOT%{l_prefix}/bin/bison \
+         $RPM_BUILD_ROOT%{l_prefix}/bin/bison-beta
+      mv $RPM_BUILD_ROOT%{l_prefix}/man/man1/bison.1 \
+         $RPM_BUILD_ROOT%{l_prefix}/man/man1/bison-beta.1
+    )
+%endif
+    ( cd bison-%{V_release}
+      %{l_make} -f Makefile %{l_mflags} install AM_MAKEFLAGS="DESTDIR=$RPM_BUILD_ROOT"
+    )
+    rm -rf $RPM_BUILD_ROOT%{l_prefix}/share/locale
     rm -f $RPM_BUILD_ROOT%{l_prefix}/info/dir
     rm -f $RPM_BUILD_ROOT%{l_prefix}/lib/charset.alias
-    rm -rf $RPM_BUILD_ROOT%{l_prefix}/share/locale
+    strip $RPM_BUILD_ROOT%{l_prefix}/bin/* >/dev/null 2>&1 || true
     %{l_rpmtool} files -v -ofiles -r$RPM_BUILD_ROOT %{l_files_std}
 
 %files -f files