--- asterisk-1.6.1.12/configure.ac~	2009-12-31 20:48:16.000000000 +0200
+++ asterisk-1.6.1.12/configure.ac	2009-12-31 20:50:47.660532467 +0200
@@ -657,10 +657,20 @@
       GSM_INTERNAL="no"
    fi
    if test "${GSM_SYSTEM}" = "yes"; then
+
+      case "$host_cpu" in
+      x86_64|s390x)
+          _lib=lib64
+          ;;
+      *)
+          _lib=lib
+          ;;
+      esac
+
       gsmlibdir=""
       if test "x${GSM_DIR}" != "x"; then
-         if test -d ${GSM_DIR}/lib; then
-            gsmlibdir="-L${GSM_DIR}/lib"
+         if test -d ${GSM_DIR}/${_lib}; then
+            gsmlibdir="-L${GSM_DIR}/${_lib}"
          else
             gsmlibdir="-L${GSM_DIR}"
          fi