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f25f602ffd
AC_REQUIRE means "if this macro hasn't been executed already, execute it". So in a wrapper around AC_RUN_IFELSE, AC_REQUIRE(AC_RUN_IFELSE) isn't correct at that will execute AC_RUN_IFELSE without any arguments. With autoconf 2.69 this is basically a no-op, but with autoconf 2.70, AC_RUN_IFELSE without a default value when cross-compiling is fatal. The result is that curl with autoconf 2.70 cannot cross-compile. Fixes https://github.com/curl/curl/issues/5126 Closes https://github.com/curl/curl/pull/5130