Blame isl-0.14/m4/ax_detect_imath.m4

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AC_DEFUN([AX_DETECT_IMATH], [
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AC_DEFINE([USE_IMATH_FOR_MP], [], [use imath to implement isl_int])
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MP_CPPFLAGS="-I$srcdir/imath_wrap"
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MP_LDFLAGS=""
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MP_LIBS=""
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SAVE_CPPFLAGS="$CPPFLAGS"
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CPPFLAGS="$MP_CPPFLAGS $CPPFLAGS"
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AC_CHECK_HEADER([imath.h], [], [AC_ERROR([imath.h header not found])])
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AC_CHECK_HEADER([gmp_compat.h], [], [AC_ERROR([gmp_compat.h header not found])])
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CPPFLAGS="$SAVE_CPPFLAGS"
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AM_CONDITIONAL(NEED_GET_MEMORY_FUNCTIONS, test x = xfalse)
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])