Add --with-subversion to configure scripts.

nmap-update/configure

@@ -657,6 +657,7 @@ SHELL'
 ac_subst_files=''
 ac_user_opts='
 enable_option_checking
+with_subversion
 '
       ac_precious_vars='build_alias
 host_alias
@@ -1272,6 +1273,11 @@ if test -n "$ac_init_help"; then
 
   cat <<\_ACEOF
 
+Optional Packages:
+  --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
+  --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)
+  --with-subversion=DIR   Look for libsvn1 in DIR/include and DIR/libs.
+
 Some influential environment variables:
   CC          C compiler command
   CFLAGS      C compiler flags
@@ -3051,6 +3057,25 @@ fi
 done
 
 
+
+# Check whether --with-subversion was given.
+if test "${with_subversion+set}" = set; then :
+  withval=$with_subversion;
+case "$with_subversion" in
+  yes)
+    ;;
+  no)
+    as_fn_error $? "Subversion and libsvn1 are required to build nmap-update." "$LINENO" 5
+    ;;
+  *)
+    CPPFLAGS="-I$with_subversion/include $CPPFLAGS"
+    LDFLAGS="-L$with_subversion/lib $LDFLAGS"
+    ;;
+  esac
+
+fi
+
+
 # Checks for libraries.
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for svn_client_create_context in -lsvn_client-1" >&5