Really ensure a Yacc alternative is installed at build time
AC_PROG_YACC falls back to YACC = "yacc" if bison or byacc are not found, but it does not mean it is present. Closes #294
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@ -12,6 +12,13 @@ AM_PROG_CC_C_O
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AC_PROG_INSTALL
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AC_PROG_INSTALL
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AM_PROG_LEX
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AM_PROG_LEX
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AC_PROG_YACC
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AC_PROG_YACC
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# AC_PROG_YACC falls back to YACC = "yacc" if bison or byacc are not found, but it does not mean it is present
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AS_IF([test x"$YACC" = "xyacc"], [
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AC_CHECK_PROG([YACC_EXISTS], [yacc], [yes], [no])
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AS_IF([test x"$YACC_EXISTS" != xyes], [
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YACC=${am_missing_run}yacc
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])
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])
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# Checks for header files.
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# Checks for header files.
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AC_FUNC_ALLOCA
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AC_FUNC_ALLOCA
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