Description:
------------
configure works - but make craps-out on posix.lo compile.



Reproduce code:
---------------
# uname -a
SunOS -a 5.10 Generic sun4u sparc SUNW,UltraAX-i2

./configure --with-apxs2=/usr/apache2/bin/apxs --prefix=/usr/local/php/php-5.1.2

make

Expected result:
----------------
during make process.....

gcc -Iext/posix/ -I/export/home/php/php-5.1.2/ext/posix/ -DPHP_ATOM_INC -I/export/home/php/php-5.1.2/include -I/export/home/php/php-5.1.2/main -I/export/home/php/php-5.1.2 -I/usr/local/include/libxml2 -I/export/home/php/php-5.1.2/ext/date/lib -I/export/home/php/php-5.1.2/TSRM -I/export/home/php/php-5.1.2/Zend -D_POSIX_PTHREAD_SEMANTICS -I/usr/local/include -g -O2 -Wall -c /export/home/php/php-5.1.2/ext/posix/posix.c  -fPIC -DPIC -o ext/posix/.libs/posix.o
In file included from /usr/include/sys/signal.h:34,
                 from /usr/include/signal.h:26,
                 from /export/home/php/php-5.1.2/ext/posix/posix.c:42:
/usr/include/sys/siginfo.h:259: error: parse error before "ctid_t"
/usr/include/sys/siginfo.h:292: error: parse error before '}' token
/usr/include/sys/siginfo.h:294: error: parse error before '}' token
/usr/include/sys/siginfo.h:390: error: parse error before "ctid_t"
/usr/include/sys/siginfo.h:392: error: conflicting types for `__proc'
/usr/include/sys/siginfo.h:261: error: previous declaration of `__proc'
/usr/include/sys/siginfo.h:398: error: conflicting types for `__fault'
/usr/include/sys/siginfo.h:267: error: previous declaration of `__fault'
/usr/include/sys/siginfo.h:404: error: conflicting types for `__file'
/usr/include/sys/siginfo.h:273: error: previous declaration of `__file'
/usr/include/sys/siginfo.h:420: error: conflicting types for `__prof'
/usr/include/sys/siginfo.h:287: error: previous declaration of `__prof'
/usr/include/sys/siginfo.h:424: error: conflicting types for `__rctl'
/usr/include/sys/siginfo.h:291: error: previous declaration of `__rctl'
/usr/include/sys/siginfo.h:426: error: parse error before '}' token
/usr/include/sys/siginfo.h:428: error: parse error before '}' token
/usr/include/sys/siginfo.h:432: error: parse error before "k_siginfo_t"
/usr/include/sys/siginfo.h:437: error: parse error before '}' token
In file included from /usr/include/signal.h:26,
                 from /export/home/php/php-5.1.2/ext/posix/posix.c:42:
/usr/include/sys/signal.h:85: error: parse error before "siginfo_t"
In file included from /export/home/php/php-5.1.2/ext/posix/posix.c:42:
/usr/include/signal.h:111: error: parse error before "siginfo_t"
/usr/include/signal.h:113: error: parse error before "siginfo_t"
*** Error code 1
make: Fatal error: Command failed for target `ext/posix/posix.lo'