fix bison version check that causes configure to abort

yodl/yodl.spec

@@ -33,7 +33,7 @@ Distribution: OpenPKG [EVAL]
 Group:        Text
 License:      GPL
 Version:      1.31.18
-Release:      20030716
+Release:      20030808
 
 #   list of sources
 Source0:      ftp://ftp.lilypond.org/pub/yodl/development/yodl-%{version}.tar.gz
@@ -59,6 +59,10 @@ AutoReqProv:  no
 %prep
     %setup -q
     %patch -p0
+    %{l_shtool} subst \
+        -e '/bison_version=/s;sed ;sed -n ;' \
+        -e '/bison_version=/s;version 1\.//g; [0-9]\\.\\([0-9.]*\\).*/\\1/p;' \
+        configure
 
 %build
     CC="%{l_cc}" \