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Philip Chimento authored
Instead of a non-optimally-portable regex, use m4 itself to remove dnl lines. Plain m4 without any autoconf extensions will remove dnl, but not expand any of the autoconf stuff. This is because autoconf undefines all of the built-in m4 macros and defines new ones that plain m4 is unaware of. https://bugzilla.gnome.org/show_bug.cgi?id=774299
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