Description:
------------
The configure call: 

env COPTFLAGS="-O2 -pipe -funroll-loops -ffast-math -fno-strict-aliasing" 
CC=clang CXX=clang++ CPP=clang-cpp CFLAGS="-O2 -pipe -fno-strict-aliasing" 
./configure --enable-fpm --with-fpm-user=www --with-fpm-group=www --disable-cgi 
--with-config-file-path=/usr/local/etc --with-config-file-scan-
dir=/usr/local/etc/php.d --with-openssl --with-zlib --enable-bcmath --enable-
calendar --with-curl --with-curlwrappers --enable-exif --enable-ftp --with-gd --
with-t1lib --enable-gd-native-ttf --with-mhash --enable-intl --enable-mbstring -
-with-mcrypt --with-mysqli --enable-pcntl --with-pdo-mysql --enable-soap --
enable-sockets --enable-sysvmsg --enable-sysvsem --enable-sysvshm --with-xsl --
enable-zip --enable-mysqlnd --with-pear

I've created a gist with more information https://gist.github.com/xenji/5377738

The gist has infos about:
- clang configure output
- the clang excerpt of the error
- a gcc version of the build attempt

I've attached the clang output in the backtrace field, too.

Please feel free to contact me for more information. As this server is not 
business critical, I could provide limited ssh access for further debugging.




Actual result:
--------------
/bin/sh /root/builds/php/php-5.5.0beta3/libtool --silent --preserve-dup-deps --
mode=compile clang -I/root/builds/php/php-5.5.0beta3/sapi/fpm -Isapi/fpm/ -
I/root/builds/php/php-5.5.0beta3/sapi/fpm/ -DPHP_ATOM_INC -
I/root/builds/php/php-5.5.0beta3/include -I/root/builds/php/php-5.5.0beta3/main 
-I/root/builds/php/php-5.5.0beta3 -I/root/builds/php/php-5.5.0beta3/ext/date/lib 
-I/root/builds/php/php-5.5.0beta3/ext/ereg/regex -I/usr/local/include/libxml2 -
I/usr/local/include -I/root/builds/php/php-5.5.0beta3/ext/mbstring/oniguruma -
I/root/builds/php/php-5.5.0beta3/ext/mbstring/libmbfl -I/root/builds/php/php-
5.5.0beta3/ext/mbstring/libmbfl/mbfl -I/root/builds/php/php-
5.5.0beta3/ext/sqlite3/libsqlite -I/root/builds/php/php-5.5.0beta3/TSRM -
I/root/builds/php/php-5.5.0beta3/Zend    -I/usr/local/include -O2 -pipe -fno-
strict-aliasing  -c /root/builds/php/php-5.5.0beta3/sapi/fpm/fpm/fpm_status.c -o 
sapi/fpm/fpm/fpm_status.lo
/bin/sh /root/builds/php/php-5.5.0beta3/libtool --silent --preserve-dup-deps --
mode=compile clang -I/root/builds/php/php-5.5.0beta3/sapi/fpm -Isapi/fpm/ -
I/root/builds/php/php-5.5.0beta3/sapi/fpm/ -DPHP_ATOM_INC -
I/root/builds/php/php-5.5.0beta3/include -I/root/builds/php/php-5.5.0beta3/main 
-I/root/builds/php/php-5.5.0beta3 -I/root/builds/php/php-5.5.0beta3/ext/date/lib 
-I/root/builds/php/php-5.5.0beta3/ext/ereg/regex -I/usr/local/include/libxml2 -
I/usr/local/include -I/root/builds/php/php-5.5.0beta3/ext/mbstring/oniguruma -
I/root/builds/php/php-5.5.0beta3/ext/mbstring/libmbfl -I/root/builds/php/php-
5.5.0beta3/ext/mbstring/libmbfl/mbfl -I/root/builds/php/php-
5.5.0beta3/ext/sqlite3/libsqlite -I/root/builds/php/php-5.5.0beta3/TSRM -
I/root/builds/php/php-5.5.0beta3/Zend    -I/usr/local/include -O2 -pipe -fno-
strict-aliasing  -c /root/builds/php/php-5.5.0beta3/sapi/fpm/fpm/fpm_stdio.c -o 
sapi/fpm/fpm/fpm_stdio.lo
/root/builds/php/php-5.5.0beta3/sapi/fpm/fpm/fpm_sockets.c:404:11: error: no 
member named 'tcpi_sacked' in 'struct tcp_info'; did you mean '__tcpi_sacked'?
        if (info.tcpi_sacked == 0) {
                 ^~~~~~~~~~~
                 __tcpi_sacked
/usr/include/netinet/tcp.h:203:12: note: '__tcpi_sacked' declared here
        u_int32_t       __tcpi_sacked;
                        ^
/root/builds/php/php-5.5.0beta3/sapi/fpm/fpm/fpm_sockets.c:409:18: error: no 
member named 'tcpi_unacked' in 'struct tcp_info'; did you mean '__tcpi_unacked'?
                *cur_lq = info.tcpi_unacked;
                               ^~~~~~~~~~~~
                               __tcpi_unacked
/usr/include/netinet/tcp.h:202:12: note: '__tcpi_unacked' declared here
        u_int32_t       __tcpi_unacked;
                        ^
/root/builds/php/php-5.5.0beta3/sapi/fpm/fpm/fpm_sockets.c:413:18: error: no 
member named 'tcpi_sacked' in 'struct tcp_info'; did you mean '__tcpi_sacked'?
                *max_lq = info.tcpi_sacked;
                               ^~~~~~~~~~~
                               __tcpi_sacked
/usr/include/netinet/tcp.h:203:12: note: '__tcpi_sacked' declared here
        u_int32_t       __tcpi_sacked;
                        ^
3 errors generated.
*** [sapi/fpm/fpm/fpm_sockets.lo] Error code 1
1 error