[cvs] bogofilter configure.ac,1.174,1.175

[<m-...@us...>]

Update of /cvsroot/bogofilter/bogofilter
In directory sc8-pr-cvs1:/tmp/cvs-serv17469

Modified Files:
	configure.ac 
Log Message:
Work around Linux ldconfig bug that strikes when different GSL versions are
installed in /usr/lib and /usr/local/lib. ldconfig will try to link against
/usr/lib regardless if the one in /usr/local/lib is newer. This leads to
problems such as undefined symbol: gsl_cdf_chisq_Q which are VERY confusing.

Index: configure.ac
===================================================================
RCS file: /cvsroot/bogofilter/bogofilter/configure.ac,v
retrieving revision 1.174
retrieving revision 1.175
diff -u -d -r1.174 -r1.175
--- configure.ac	3 Oct 2003 13:49:35 -0000	1.174
+++ configure.ac	10 Oct 2003 09:55:02 -0000	1.175
@@ -480,6 +480,23 @@
     )
 fi
 
+dnl work around Linux ldconfig design bug
+dnl ldconfig will cache libraries in order found in library search
+dnl order rather than by minor version, so it will happily link against
+dnl /usr/lib/libgsl.so.0 (which is 0.4.0) when
+dnl /usr/local/lib/libgsl.so.0 (which is 0.5.0) is available
+dnl so try to find gsl-config in trusted system path first
+
+AC_MSG_NOTICE([-------------------------------------------------------------])
+AC_MSG_NOTICE([If you have multiple versions of GSL installed, this])
+AC_MSG_NOTICE([configure script will prefer the one in /lib or /usr/lib])
+AC_MSG_NOTICE([to work around a bug in Linux ldconfig.])
+AC_MSG_NOTICE([Deinstall the older GSL version if this behaviour annoys you.])
+AC_MSG_NOTICE([-------------------------------------------------------------])
+
+PATH_SAVED="$PATH"
+PATH=/bin:/usr/bin:$PATH
+
 need_my_gsl=1
 AM_PATH_GSL(1.4, AC_DEFINE(HAVE_GSL_14,,[Define if you have GNU Scientific Library 1.4 or newer])
 need_my_gsl=0)
@@ -488,6 +505,8 @@
 if test "$need_my_gsl" = 1 ; then
   GSL_LIBS="libbf_gsl.a"
 fi
+
+PATH="$PATH_SAVED"
 
 AM_CONDITIONAL(NEED_GSL,test $need_my_gsl = 1)