diff -ru xemacs-21.5.28.20080401//configure.ac xemacs-21.5.28.20080401.new//configure.ac
--- xemacs-21.5.28.20080401//configure.ac	2008-04-01 19:40:34.000000000 +0200
+++ xemacs-21.5.28.20080401.new//configure.ac	2008-04-02 14:21:16.000000000 +0200
@@ -5411,8 +5411,8 @@
 
 dnl Check for DBM support in libgdbm.
 if test "$enable_database_gdbm" != "no"; then
-  AC_CHECK_LIB(gdbm, dbm_open, [
-   enable_database_gdbm=yes enable_database_dbm=no libdbm=-lgdbm], [
+  AC_CHECK_LIB(ndbm, dbm_open, [
+   enable_database_gdbm=yes enable_database_dbm=no libdbm=-lndbm], [
        AC_CHECK_LIB(gdbm_compat, dbm_open, [
        enable_database_gdbm=yes enable_database_dbm=no libdbm="-lgdbm_compat -lgdbm"], [
    if test "$enable_database_gdbm" = "yes"; then
xemacs-21.5.28.20080401.new/だけに発見: configure.ac.~1~