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diff --git a/m4/ensc_cxxcompiler.m4 b/m4/ensc_cxxcompiler.m4
new file mode 100644
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+++ b/m4/ensc_cxxcompiler.m4
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+dnl $Id: ensc_cxxcompiler.m4,v 1.3 2005/04/10 00:52:57 ensc Exp $
+
+dnl Copyright (C) 2002 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
+dnl  
+dnl This program is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; version 2 of the License.
+dnl  
+dnl This program is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+dnl GNU General Public License for more details.
+dnl  
+dnl You should have received a copy of the GNU General Public License
+dnl along with this program; if not, write to the Free Software
+dnl Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+AC_DEFUN([ENSC_CXXCOMPILER],
+[
+	AC_REQUIRE([AC_PROG_CXX])
+
+	AC_CACHE_CHECK([whether $CXX is a C++ compiler], [ensc_cv_cxx_cxxcompiler],
+        [
+		AC_LANG_PUSH(C++)
+		AC_COMPILE_IFELSE([
+		    #include <ostream>
+                ],
+                [ensc_cv_cxx_cxxcompiler=yes],
+                [ensc_cv_cxx_cxxcompiler=no])
+		AC_LANG_POP(C++)
+        ])
+
+	AM_CONDITIONAL(ENSC_HAVE_CXX_COMPILER,
+                       [test x"$ensc_cv_cxx_cxxcompiler" = xyes])
+
+	if test x"$ensc_cv_cxx_cxxcompiler" = xno; then
+		AC_MSG_WARN([*** some programs will not be built because a C++ compiler is lacking])
+	fi
+])
+
+AC_DEFUN([ENSC_C99COMPILER],
+[
+	AC_REQUIRE([AC_PROG_CC])
+
+	AC_CACHE_CHECK([whether $CC is a C99 compiler], [ensc_cv_c99_c99compiler],
+        [
+		AC_LANG_PUSH(C)
+		AC_COMPILE_IFELSE([
+int main(int argc, char *argv[]) {
+  struct { int x; }   a = { .x = argc };
+  if (0) return 0;
+  int b;
+}
+                ],
+                [ensc_cv_c99_c99compiler=yes],
+                [ensc_cv_c99_c99compiler=no])
+		AC_LANG_POP(C)
+        ])
+
+	AM_CONDITIONAL(ENSC_HAVE_C99_COMPILER,
+                       [test x"$ensc_cv_c99_c99compiler" = xyes])
+
+	if test x"$ensc_cv_c99_c99compiler" = xno; then
+		AC_MSG_WARN([*** some programs will not be built because system is lacking a C99 compiler])
+	fi
+])