diff -aur YACS_SRC_5.1.2.old/adm/unix/config_files/ac_linker_options.m4 YACS_SRC_5.1.2/adm/unix/config_files/ac_linker_options.m4
--- YACS_SRC_5.1.2.old/adm/unix/config_files/ac_linker_options.m4	2009-07-06 13:45:35.000000000 +0200
+++ YACS_SRC_5.1.2/adm/unix/config_files/ac_linker_options.m4	2009-08-08 14:14:44.000000000 +0200
@@ -23,6 +23,10 @@
 
   AC_CHECKING(for LIB_LOCATION_SUFFIX)
   LIB_LOCATION_SUFFIX=""
+  case "$build_cpu" in
+  x86_64*)  LIB_LOCATION_SUFFIX="64" ;;
+  *)        LIB_LOCATION_SUFFIX="" ;;
+  esac
   AC_SUBST(LIB_LOCATION_SUFFIX)
   AC_MSG_RESULT(LIB_LOCATION_SUFFIX is $LIB_LOCATION_SUFFIX)
 
diff -aur YACS_SRC_5.1.2.old/adm/unix/make_begin.am YACS_SRC_5.1.2/adm/unix/make_begin.am
--- YACS_SRC_5.1.2.old/adm/unix/make_begin.am	2009-07-06 13:45:36.000000000 +0200
+++ YACS_SRC_5.1.2/adm/unix/make_begin.am	2009-08-08 18:59:55.000000000 +0200
@@ -22,7 +22,7 @@
 
 # Standard directory for installation
 salomeincludedir   = $(includedir)/salome
-libdir             = $(prefix)/lib/salome
+libdir             = $(prefix)/lib$(LIB_LOCATION_SUFFIX)/salome
 bindir             = $(prefix)/bin/salome
 salomescriptdir    = $(bindir)
 salomepythondir    = $(pythondir)/salome
diff -aur YACS_SRC_5.1.2.old/src/genericgui/Makefile.am YACS_SRC_5.1.2/src/genericgui/Makefile.am
--- YACS_SRC_5.1.2.old/src/genericgui/Makefile.am	2009-07-06 13:45:44.000000000 +0200
+++ YACS_SRC_5.1.2/src/genericgui/Makefile.am	2009-08-08 18:04:36.000000000 +0200
@@ -16,7 +16,7 @@
 #
 #  See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
 #
-libdir             = $(prefix)/lib/salome
+libdir             = $(prefix)/lib$(LIB_LOCATION_SUFFIX)/salome
 bindir             = $(prefix)/bin/salome
 
 lib_LTLIBRARIES = libGenericGui.la