diff --git a/ChangeLog b/ChangeLog
index b820db5f9c9..ca4f48354d5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2000-10-16  Matthias Klose  <doko@debian.org> 
+ 
+	* config.if: Search libstdc++-v3/configure.in for INTERFACE,
+	when configured for libstdc++-v3.
+
 2000-10-05  Phil Edwards  <pme@gcc.gnu.org>
 
 	* configure: Save configure arguments to gcc/configargs.h.
diff --git a/config.if b/config.if
index 625a4077ec0..31c8551d00f 100644
--- a/config.if
+++ b/config.if
@@ -23,15 +23,12 @@ fi
 
 if [ "${enable_libstdcxx_v3}" = "yes" ] ; then
   libstdcxx_srcdir=${if_topsrcdir}/libstdc++-v3
+  # We check libstdc++-v3/configure.in for libstdcxx_interface.
+  libstdcxx_interface=`grep "^INTERFACE" ${libstdcxx_srcdir}/configure.in | sed 's/INTERFACE[ 	]*=[ 	]*\(.*\)/\1/'`
 else
   libstdcxx_srcdir=${if_topsrcdir}/libstdc++
-fi
-
-if [ -f ${libstdcxx_srcdir}/Makefile.in ]; then
-# We check libstdc++ for libstdcxx_interface.
-libstdcxx_interface=`grep "^INTERFACE" ${libstdcxx_srcdir}/Makefile.in | sed 's/INTERFACE[ 	]*=[ 	]*\(.*\)/\1/'`
-else
-libstdcxx_interface=
+  # We check libstdc++/Makefile.in for libstdcxx_interface.
+  libstdcxx_interface=`grep "^INTERFACE" ${libstdcxx_srcdir}/Makefile.in | sed 's/INTERFACE[ 	]*=[ 	]*\(.*\)/\1/'`
 fi
 
 if [ -f ${if_topsrcdir}/gcc/cp/Makefile.in ]; then