Index: gcc/config/i386/t-linux64
===================================================================
--- gcc/config/i386/t-linux64	(revision 128844)
+++ gcc/config/i386/t-linux64	(revision 128845)
@@ -4,9 +4,16 @@
 SHLIB_MAPFILES = $(srcdir)/libgcc-std.ver \
 		 $(srcdir)/config/i386/libgcc-x86_64-glibc.ver
 
+# On Debian, Ubuntu and other derivitive distributions, the 32bit libraries
+# are found in /lib32 and /usr/lib32, /lib64 and /usr/lib64 are symlinks to
+# /lib and /usr/lib, while other distributions install libraries into /lib64
+# and /usr/lib64.  The LSB does not enforce the use of /lib64 and /usr/lib64,
+# it doesn't tell anything about the 32bit libraries on those systems.  Set
+# MULTILIB_OSDIRNAMES according to what is found on the target.
+
 MULTILIB_OPTIONS = m64/m32
 MULTILIB_DIRNAMES = 64 32 
-MULTILIB_OSDIRNAMES = ../lib64 ../lib
+MULTILIB_OSDIRNAMES = ../lib64 $(if $(wildcard $(shell echo $(SYSTEM_HEADER_DIR))/../../usr/lib32),../lib32,../lib)
 
 LIBGCC = stmp-multilib
 INSTALL_LIBGCC = install-multilib