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diff --git a/m4/ac_cxx_have_complex.m4 b/m4/ac_cxx_have_complex.m4
deleted file mode 100644
index 85d5b7e..0000000
--- a/m4/ac_cxx_have_complex.m4
+++ /dev/null
@@ -1,24 +0,0 @@
-dnl @synopsis AC_CXX_HAVE_COMPLEX
-dnl
-dnl If the compiler has complex<T>, define HAVE_COMPLEX.
-dnl
-dnl @version $Id: ac_cxx_have_complex.m4,v 1.1 2005/01/07 02:52:49 norwin Exp $
-dnl @author Todd Veldhuizen and Luc Maisonobe <luc@spaceroots.org>
-dnl
-AC_DEFUN([AC_CXX_HAVE_COMPLEX],
-[AC_CACHE_CHECK(whether the compiler has complex<T>,
-ac_cv_cxx_have_complex,
-[AC_REQUIRE([AC_CXX_NAMESPACES])
- AC_LANG_SAVE
- AC_LANG_CPLUSPLUS
- AC_TRY_COMPILE([#include <complex>
-#ifdef HAVE_NAMESPACES
-using namespace std;
-#endif],[complex<float> a; complex<double> b; return 0;],
- ac_cv_cxx_have_complex=yes, ac_cv_cxx_have_complex=no)
- AC_LANG_RESTORE
-])
-if test "$ac_cv_cxx_have_complex" = yes; then
-  AC_DEFINE(HAVE_COMPLEX,,[define if the compiler has complex<T>])
-fi
-])