diff --git a/configure.ac b/configure.ac
index 2681362..9fec1ce 100644
--- a/configure.ac
+++ b/configure.ac
@@ -197,7 +197,9 @@ AC_SUBST(LIBTOOL_DEPS)
 
 AC_PROG_INSTALL
 
-AC_CHECK_HEADERS()
+dnl GNU libtool checks them by default/unconditionally, but slibtool does not.
+dnl So accept the ugly double check and -DHAVE_*_H arguments with GNU libtool.
+AC_CHECK_HEADERS(stdint.h inttypes.h stdlib.h)
 
 THREAD_LIBS=-lpthread
 AC_SUBST(THREAD_LIBS)