libsigsegv.m4: --with-libsigsegv-prefix is ignored

[Sam Steingold]

with the clisp/src/configure file, generated from libsigsegv.m4 serial 2 and 
the following patch:

===================================================================
RCS file: /cvsroot/clisp/clisp/src/configure,v
retrieving revision 1.221
diff -u -w -p -r1.221 configure
--- src/configure       12 Aug 2008 20:47:51 -0000      1.221
+++ src/configure       9 Sep 2008 18:53:44 -0000
@@ -31691,6 +31691,9 @@ fi
     fi
   done

+echo INCSIGSEGV=$INCSIGSEGV
+echo gl_save_CPPFLAGS=$gl_save_CPPFLAGS
+echo CPPFLAGS=$CPPFLAGS

   { $as_echo "$as_me:$LINENO: checking for libsigsegv" >&5
 $as_echo_n "checking for libsigsegv... " >&6; }
===================================================================

I get the following output from

./configure --with-libsigsegv-prefix=/home/sds/src/top CC='gcc -m64'  build-O 
--with-module=rawsock

on Linux ada 2.6.24-1-sparc64-smp:


INCSIGSEGV=
gl_save_CPPFLAGS=
CPPFLAGS=
checking for libsigsegv... (cached) no, consider installing GNU libsigsegv

even though I do have libsigsegv installed:

$ ls -R /home/sds/src/top
/home/sds/src/top:
total 8
4 include/  4 lib/

/home/sds/src/top/include:
total 8
8 sigsegv.h

/home/sds/src/top/lib:
total 48
44 libsigsegv.a   4 libsigsegv.la*

Sam.