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There are seven separate build attempts in the attached main.log, but the problem appears to be:
:info:build In file included from libavutil/cpu.c:44:
:info:build In file included from /usr/include/sys/sysctl.h:83:
:info:build /usr/include/sys/ucred.h:91:2: error: unknown type name 'u_long'; did you mean 'long'?
:info:build u_long cr_ref; /* reference count */
:info:build ^
:info:build /usr/include/sys/ucred.h:133:9: error: unknown type name 'u_int'
:info:build u_int cr_version; /* structure layout version */
:info:build ^
:info:build In file included from libavutil/cpu.c:44:
:info:build In file included from /usr/include/sys/sysctl.h:84:
:info:build /usr/include/sys/proc.h:113:2: error: unknown type name 'u_int'
:info:build u_int p_estcpu; /* Time averaged value of p_cpticks. */
:info:build ^
:info:build /usr/include/sys/proc.h:118:2: error: unknown type name 'u_int'
:info:build u_int p_swtime; /* Time swapped in or out. */
:info:build ^
:info:build /usr/include/sys/proc.h:119:2: error: unknown type name 'u_int'
:info:build u_int p_slptime; /* Time since last blocked. */
:info:build ^
:info:build /usr/include/sys/proc.h:133:2: error: unknown type name 'u_char'; did you mean 'char'?
:info:build u_char p_priority; /* Process priority. */
:info:build ^
:info:build /usr/include/sys/proc.h:134:2: error: unknown type name 'u_char'; did you mean 'char'?
:info:build u_char p_usrpri; /* User-priority based on p_cpu and p_nice. */
:info:build ^
:info:build /usr/include/sys/proc.h:139:2: error: unknown type name 'u_short'; did you mean 'short'?
:info:build u_short p_xstat; /* Exit status for wait; also stop signal. */
:info:build ^
:info:build /usr/include/sys/proc.h:140:2: error: unknown type name 'u_short'; did you mean 'short'?
:info:build u_short p_acflag; /* Accounting flags. */
:info:build ^
:info:build 9 errors generated.
:info:build gmake: *** [ffbuild/common.mak:59: libavutil/cpu.o] Error 1