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[AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake
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# This definition overrides the AC_C_RESTRICT macro from autoconf 2.60..2.61,
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# so that mixed use of GNU C and GNU C++ and mixed use of Sun C and Sun C++
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# This definition can be removed once autoconf >= 2.62 can be assumed.
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m4_if(m4_version_compare(m4_defn([m4_PACKAGE_VERSION]),[2.62]),[-1],[
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AC_DEFUN([AC_C_RESTRICT],
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[AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict],