diff -Nuar bison-2.6.5-orig/configure bison-2.6.5/configure
--- bison-2.6.5-orig/configure	2012-11-15 16:36:32.000000000 -0500
+++ bison-2.6.5/configure	2012-11-15 16:36:54.000000000 -0500
@@ -8382,15 +8382,16 @@
       # Root out GNU M4 1.4.15 with buggy false negative replacement strstr.
       # Root out Glibc 2.9 - 2.12 and GNU M4 1.4.11 - 1.4.15 with buggy
       # false positive strstr.
-      ac_snippet=change'quote(<,>)in''dir(<if''def>,mac,bug)'
-      ac_snippet=${ac_snippet}pat'subst(a,\(b\)\|\(a\),\1)d'nl
-      ac_snippet=${ac_snippet}${as_nl}if'else(in''dex(..wi.d.,.d.),-1,bug)'
-      ac_snippet=${ac_snippet}${as_nl}if'else(in''dex(;:11-:12-:12-:12-:12-:12-:12-:12-:12.:12.:12.:12.:12.:12.:12.:12.:12-,:12-:12-:12-:12-:12-:12-:12-:12-),-1,,strstr-bug2)'
-      test -z "`$ac_path_M4 -F conftest.m4f </dev/null 2>&1`" \
-      && test -z "`$as_echo $ac_snippet | $ac_path_M4 --trace=mac 2>&1`" \
-      && test -f conftest.m4f \
-      && ac_cv_path_M4=$ac_path_M4 ac_path_M4_found=:
-      rm -f conftest.m4f
+      #ac_snippet=change'quote(<,>)in''dir(<if''def>,mac,bug)'
+      #ac_snippet=${ac_snippet}pat'subst(a,\(b\)\|\(a\),\1)d'nl
+      #ac_snippet=${ac_snippet}${as_nl}if'else(in''dex(..wi.d.,.d.),-1,bug)'
+      #ac_snippet=${ac_snippet}${as_nl}if'else(in''dex(;:11-:12-:12-:12-:12-:12-:12-:12-:12.:12.:12.:12.:12.:12.:12.:12.:12-,:12-:12-:12-:12-:12-:12-:12-:12-),-1,,strstr-bug2)'
+      #test -z "`$ac_path_M4 -F conftest.m4f </dev/null 2>&1`" \
+      #&& test -z "`$as_echo $ac_snippet | $ac_path_M4 --trace=mac 2>&1`" \
+      #&& test -f conftest.m4f \
+      #&& ac_cv_path_M4=$ac_path_M4 ac_path_M4_found=:
+      #rm -f conftest.m4f
+      ac_cv_path_M4=$ac_path_M4 ac_path_M4_found=:
       $ac_path_M4_found && break 3
     done
   done