fix building under Solaris

bison/bison.spec

@@ -33,7 +33,7 @@ Distribution: OpenPKG [REL]
 Group:        Language
 License:      GPL
 Version:      1.35
-Release:      20020326
+Release:      20020402
 
 #   list of sources
 Source0:      ftp://ftp.gnu.org/gnu/bison/bison-%{version}.tar.gz
@@ -62,6 +62,7 @@ AutoReqProv:  no
 %build
     CC="%{l_cc}" \
     CFLAGS="%{l_cflags -O}" \
+    CONFIG_SHELL=/bin/sh \
     ./configure \
         --prefix=%{l_prefix}
     %{l_make} -f Makefile %{l_mflags}