+AC_CHECK_HEADERS([security/pam_appl.h], [], [
+ AC_MSG_ERROR([[PAM headers not found]])
+])
+AC_CHECK_HEADERS([security/pam_modules.h security/_pam_macros.h \
+ security/pam_modutil.h], [], [], [
+#include <sys/types.h>
+#include <security/pam_appl.h>
+])
+AC_CHECK_LIB([pam], [pam_start])
+AC_CHECK_FUNCS([pam_modutil_drop_priv])
+AC_SUBST(PAMDIR, "\$(exec_prefix)/lib/security")
+AC_ARG_WITH(pam-dir,
+ [ --with-pam-dir=DIR path to install PAM module],
+ [PAMDIR="$withval"],
+ [])
+