error: field 'aio_sigevent' has incomplete type

[Janos Dohanics]

I am trying to build a new kernel for an amd64 machine but the build
fails:

objcopy --only-keep-debug ahd.ko.debug ahd.ko.symbols
objcopy --strip-debug --add-gnu-debuglink=ahd.ko.symbols ahd.ko.debug
ahd.ko
===> aio (all)
cc -c -O2 -frename-registers -pipe -fno-strict-aliasing  -std=c99 -g
-Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes 
-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -Wundef
-Wno-pointer-sign -fformat-extensions -nostdinc  -I. -I/usr/src/sys
-I/usr/src/sys/contrib/altq -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS
-include opt_global.h -fno-common -finline-limit=8000 --param
inline-unit-growth=100 --param large-function-growth=1000 
-mcmodel=kernel -mno-red-zone  -mfpmath=387 -mno-sse -mno-sse2 -mno-mmx
-mno-3dnow  -msoft-float -fno-asynchronous-unwind-tables -ffreestanding
-Werror  /usr/src/sys/libkern/scanc.c
cc -c -O2 -frename-registers -pipe -fno-strict-aliasing  -std=c99 -g
-Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes 
-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -Wundef
-Wno-pointer-sign -fformat-extensions -nostdinc  -I. -I/usr/src/sys
-I/usr/src/sys/contrib/altq -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS
-include opt_global.h -fno-common -finline-limit=8000 --param
inline-unit-growth=100 --param large-function-growth=1000 
-mcmodel=kernel -mno-red-zone  -mfpmath=387 -mno-sse -mno-sse2 -mno-mmx
-mno-3dnow  -msoft-float -fno-asynchronous-unwind-tables -ffreestanding
-Werror  /usr/src/sys/libkern/skpc.c
cc -c -O2 -frename-registers -pipe -fno-strict-aliasing  -std=c99 -g
-Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes 
-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -Wundef
-Wno-pointer-sign -fformat-extensions -nostdinc  -I. -I/usr/src/sys
-I/usr/src/sys/contrib/altq -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS
-include opt_global.h -fno-common -finline-limit=8000 --param
inline-unit-growth=100 --param large-function-growth=1000 
-mcmodel=kernel -mno-red-zone  -mfpmath=387 -mno-sse -mno-sse2 -mno-mmx
-mno-3dnow  -msoft-float -fno-asynchronous-unwind-tables -ffreestanding
-Werror  /usr/src/sys/libkern/strcasecmp.c
cc -c -O2 -frename-registers -pipe -fno-strict-aliasing  -std=c99 -g
-Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes 
-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -Wundef
-Wno-pointer-sign -fformat-extensions -nostdinc  -I. -I/usr/src/sys
-I/usr/src/sys/contrib/altq -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS
-include opt_global.h -fno-common -finline-limit=8000 --param
inline-unit-growth=100 --param large-function-growth=1000 
-mcmodel=kernel -mno-red-zone  -mfpmath=387 -mno-sse -mno-sse2 -mno-mmx
-mno-3dnow  -msoft-float -fno-asynchronous-unwind-tables -ffreestanding
-Werror  /usr/src/sys/libkern/strcat.c
cc -O2 -fno-strict-aliasing -pipe  -D_KERNEL -DKLD_MODULE -std=c99
-nostdinc   -DHAVE_KERNEL_OPTION_HEADERS -include
/usr/obj/usr/src/sys/FRACASSO2009012201/opt_global.h -I. -I@
-I@/contrib/altq -finline-limit=8000 --param inline-unit-growth=100
--param large-function-growth=1000 -fno-common -g
-fno-omit-frame-pointer -I/usr/obj/usr/src/sys/FRACASSO2009012201
-mcmodel=kernel -mno-red-zone  -mfpmath=387 -mno-sse -mno-sse2 -mno-mmx
-mno-3dnow  -msoft-float -fno-asynchronous-unwind-tables -ffreestanding
-Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes 
-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -Wundef
-Wno-pointer-sign -fformat-extensions -c
/usr/src/sys/modules/aio/../../kern/vfs_aio.c
/usr/src/sys/modules/aio/../../kern/vfs_aio.c:2548: error: field
'aio_sigevent' has incomplete type
/usr/src/sys/modules/aio/../../kern/vfs_aio.c:2564: error: field
'aio_sigevent' has incomplete type
/usr/src/sys/modules/aio/../../kern/vfs_aio.c: In function
'convert_old_sigevent32':
/usr/src/sys/modules/aio/../../kern/vfs_aio.c:2575: error: dereferencing
pointer to incomplete type
/usr/src/sys/modules/aio/../../kern/vfs_aio.c:2580: error: dereferencing
pointer to incomplete type
/usr/src/sys/modules/aio/../../kern/vfs_aio.c:2584: error: dereferencing
pointer to incomplete type
/usr/src/sys/modules/aio/../../kern/vfs_aio.c:2585: error: dereferencing
pointer to incomplete type
/usr/src/sys/modules/aio/../../kern/vfs_aio.c: In function
'convert_sigevent32':
/usr/src/sys/modules/aio/../../kern/vfs_aio.c:2621: error: dereferencing
pointer to incomplete type
/usr/src/sys/modules/aio/../../kern/vfs_aio.c:2626: error: dereferencing
pointer to incomplete type
/usr/src/sys/modules/aio/../../kern/vfs_aio.c:2629: error: dereferencing
pointer to incomplete type
/usr/src/sys/modules/aio/../../kern/vfs_aio.c:2632: error: dereferencing
pointer to incomplete type
/usr/src/sys/modules/aio/../../kern/vfs_aio.c:2633: error: dereferencing
pointer to incomplete type
/usr/src/sys/modules/aio/../../kern/vfs_aio.c: In function
'freebsd32_olio_listio':
/usr/src/sys/modules/aio/../../kern/vfs_aio.c:2859: error: storage size
of 'osig' isn't known
/usr/src/sys/modules/aio/../../kern/vfs_aio.c:2859: warning: unused
variable 'osig'
/usr/src/sys/modules/aio/../../kern/vfs_aio.c: In function
'freebsd32_lio_listio':
/usr/src/sys/modules/aio/../../kern/vfs_aio.c:2904: error: storage size
of 'sig32' isn't known
/usr/src/sys/modules/aio/../../kern/vfs_aio.c:2904: warning: unused
variable 'sig32'
*** Error code 1
1 error
*** Error code 2
1 error
*** Error code 2
cc -c -O2 -frename-registers -pipe -fno-strict-aliasing  -std=c99 -g
-Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes 
-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -Wundef
-Wno-pointer-sign -fformat-extensions -nostdinc  -I. -I/usr/src/sys
-I/usr/src/sys/contrib/altq -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS
-include opt_global.h -fno-common -finline-limit=8000 --param
inline-unit-growth=100 --param large-function-growth=1000 
-mcmodel=kernel -mno-red-zone  -mfpmath=387 -mno-sse -mno-sse2 -mno-mmx
-mno-3dnow  -msoft-float -fno-asynchronous-unwind-tables -ffreestanding
-Werror  /usr/src/sys/libkern/strcmp.c
cc -c -O2 -frename-registers -pipe -fno-strict-aliasing  -std=c99 -g
-Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes 
-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -Wundef
-Wno-pointer-sign -fformat-extensions -nostdinc  -I. -I/usr/src/sys
-I/usr/src/sys/contrib/altq -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS
-include opt_global.h -fno-common -finline-limit=8000 --param
inline-unit-growth=100 --param large-function-growth=1000 
-mcmodel=kernel -mno-red-zone  -mfpmath=387 -mno-sse -mno-sse2 -mno-mmx
-mno-3dnow  -msoft-float -fno-asynchronous-unwind-tables -ffreestanding
-Werror  /usr/src/sys/libkern/strcpy.c
1 error
*** Error code 2
1 error
*** Error code 2
1 error

# uname -prsv
FreeBSD 7.0-RELEASE FreeBSD 7.0-RELEASE #0: Sun Feb 24 10:35:36 UTC 2008 
   root at driscoll.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64

I Googled and found a page which seems to show a similar error:

http://www.mavetju.org/mail/view_message.php?list=freebsd-tinderbox&id=2855870&raw=yes

Would you please advise...