htmldir was introduced in autoconf 2.59c: set a reasonable value for earlier versions.
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@ -114,6 +114,12 @@ AC_SUBST(CWARNFLAGS)
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GCC_CHECK_VISIBILITY()
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# htmldir is not defined prior to autoconf 2.59c, so on earlier versions
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# set an equivalent value.
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AC_PREREQ([2.59c], [], [AC_SUBST([htmldir], [m4_ifset([AC_PACKAGE_TARNAME],
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['${datadir}/doc/${PACKAGE_TARNAME}'],
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['${datadir}/doc/${PACKAGE}'])
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])])
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AM_CHECK_DOXYGEN()
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AC_CONFIG_FILES([Makefile src/Makefile tests/Makefile doc/Makefile])
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