--- a/hints/linux.sh
+++ b/hints/linux.sh
@@ -204,6 +204,24 @@ case "$libc" in
     ;;
 esac
 
+# Ubuntu 11.04 (and later, presumably) doesn't keep most libraries
+# (such as -lm) in /lib or /usr/lib.  So we have to ask gcc to tell us
+# where to look.  We don't want gcc's own libraries, however, so we
+# filter those out.
+# This could be conditional on Unbuntu, but other distributions may
+# follow suit, and this scheme seems to work even on rather old gcc's.
+# This unconditionally uses gcc because even if the user is using another
+# compiler, we still need to find the math library and friends, and I don't
+# know how other compilers will cope with that situation.
+# Still, as an escape hatch, allow Configure command line overrides to
+# plibpth to bypass this check.
+case "$plibpth" in
+'') plibpth=`gcc -print-search-dirs | grep libraries |
+	cut -f2- -d= | tr ':' $trnl | grep -v 'gcc'`
+    plibpth="$plibpth"  # Collapse all entries on one line
+    ;;
+esac
+
 # Are we using ELF?  Thanks to Kenneth Albanowski <kjahds@kjahds.com>
 # for this test.
 cat >try.c <<'EOM'