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bacula: fix cross compiling for armv7l
got this error while cross compiling: checking whether setpgrp takes no argument... configure: error: cannot check setpgrp when cross compiling autoconf manual says: — Macro: AC_FUNC_SETPGRP If setpgrp takes no argument (the Posix version), define SETPGRP_VOID. Otherwise, it is the BSD version, which takes two process IDs as arguments. This macro does not check whether setpgrp exists at all; if you need to work in that situation, first call AC_CHECK_FUNC for setpgrp. The result of this macro is cached in the ac_cv_func_setpgrp_void variable. This macro is obsolescent, as current systems have a setpgrp whose signature conforms to Posix. New programs need not use this macro. So override it with caching variable.
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