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* m4/ax_prepend_flag.m4: New fileP. J. McDermott2021-09-261-0/+51
Now needed for AX_CFLAGS_WARN_ALL(). Fixes: configure.ac:55: error: macro AX_PREPEND_FLAG is not defined; is a m4 file missing? m4/ax_require_defined.m4:35: AX_REQUIRE_DEFINED is expanded from... m4/ax_cflags_warn_all.m4:84: AX_FLAGS_WARN_ALL is expanded from... m4/ax_cflags_warn_all.m4:142: AX_CFLAGS_WARN_ALL is expanded from... configure.ac:55: the top level