diff --git a/configure.in b/configure.in
index 7e05ba9ebd..88d653f645 100644
--- a/configure.in
+++ b/configure.in
@@ -117,6 +117,10 @@ case "$host" in
     ;;
 esac
 
+#  Enable debugging
+AC_ARG_ENABLE(64,
+[AC_HELP_STRING([--enable-64],[build with 64 bit support])],[enable_64="$enable_64"],[enable_64="yes"])
+
 # tweak compiler specific flags
 if test "x${ax_cv_c_compiler_vendor}"  =  "xsun" ; then
     APR_ADDTO(SWITCH_AM_CFLAGS, -KPIC)
@@ -126,6 +130,10 @@ if test "x${ax_cv_c_compiler_vendor}"  =  "xsun" ; then
     APR_ADDTO(SWITCH_AM_CXXFLAGS, "-features=extensions")
 
     APR_ADDTO(SWITCH_AM_LDFLAGS, -R${prefix}/lib)
+    if test "${enable_64}" = "yes"; then
+        APR_ADDTO(SWITCH_AM_CFLAGS, -m64)
+        APR_ADDTO(SWITCH_AM_LDFLAGS, -L/opt/csw/lib/amd64)
+    fi
 elif test "x${ax_cv_c_compiler_vendor}" = "xgnu" ; then
     APR_ADDTO(SWITCH_AM_CFLAGS, -fPIC)
     APR_ADDTO(SWITCH_AM_CXXFLAGS, -fPIC)