diff --git a/ares/configure.ac b/ares/configure.ac
index 2d09dbacc0..09eb4eae9c 100644
--- a/ares/configure.ac
+++ b/ares/configure.ac
@@ -64,11 +64,15 @@ AC_HELP_STRING([--disable-debug],[Disable debug options]),
 )
 
 dnl skip libtool C++ and Fortran compiler checks
+m4_ifdef([AC_PROG_CXX], [m4_undefine([AC_PROG_CXX])])
 m4_defun([AC_PROG_CXX],[])
+m4_ifdef([AC_PROG_F77], [m4_undefine([AC_PROG_F77])])
 m4_defun([AC_PROG_F77],[])
 
 dnl skip libtool C++ and Fortran linker checks
+m4_ifdef([AC_LIBTOOL_CXX], [m4_undefine([AC_LIBTOOL_CXX])])
 m4_defun([AC_LIBTOOL_CXX],[])
+m4_ifdef([AC_LIBTOOL_F77], [m4_undefine([AC_LIBTOOL_F77])])
 m4_defun([AC_LIBTOOL_F77],[])
 
 dnl libtool setup
diff --git a/configure.ac b/configure.ac
index b8a16f8e97..d54dd2fc52 100644
--- a/configure.ac
+++ b/configure.ac
@@ -116,11 +116,15 @@ dnl support building of Windows DLLs
 AC_LIBTOOL_WIN32_DLL
 
 dnl skip libtool C++ and Fortran compiler checks
+m4_ifdef([AC_PROG_CXX], [m4_undefine([AC_PROG_CXX])])
 m4_defun([AC_PROG_CXX],[])
+m4_ifdef([AC_PROG_F77], [m4_undefine([AC_PROG_F77])])
 m4_defun([AC_PROG_F77],[])
 
 dnl skip libtool C++ and Fortran linker checks
+m4_ifdef([AC_LIBTOOL_CXX], [m4_undefine([AC_LIBTOOL_CXX])])
 m4_defun([AC_LIBTOOL_CXX],[])
+m4_ifdef([AC_LIBTOOL_F77], [m4_undefine([AC_LIBTOOL_F77])])
 m4_defun([AC_LIBTOOL_F77],[])
 
 dnl libtool setup