Description:
------------
The following error occured after several minutes trying to make php7 on Ubuntu 14.04

de -g -O2 -fvisibility=hidden   -c /home/user/php7/php-src/ext/hash/hash_sha3.c -o ext/hash/hash_sha3.lo
/home/user/php7/php-src/ext/hash/hash_sha3.c: In function ‘load64’:
/home/user/php7/php-src/ext/hash/hash_sha3.c:42:2: error: ‘for’ loop initial declarations are only allowed in C99 mode
  for (unsigned char i = 7; i >= 0; --i) {
  ^
/home/user/php7/php-src/ext/hash/hash_sha3.c:42:2: note: use option -std=c99 or -std=gnu99 to compile your code
/home/user/php7/php-src/ext/hash/hash_sha3.c: In function ‘store64’:
/home/user/php7/php-src/ext/hash/hash_sha3.c:49:2: error: ‘for’ loop initial declarations are only allowed in C99 mode
  for (unsigned char i = 0; i < 8; ++i) {
  ^
/home/user/php7/php-src/ext/hash/hash_sha3.c:50:3: error: assignment of read-only location ‘*(x + (sizetype)((unsigned int)i * 1u))’
   x[i] = val & 0xFF;
   ^
/home/user/php7/php-src/ext/hash/hash_sha3.c: In function ‘xor64’:
/home/user/php7/php-src/ext/hash/hash_sha3.c:55:2: error: ‘for’ loop initial declarations are only allowed in C99 mode
  for (unsigned char i = 0; i < 8; ++i) {
  ^
/home/user/php7/php-src/ext/hash/hash_sha3.c:56:3: error: assignment of read-only location ‘*(x + (sizetype)i)’
   x[i] ^= val & 0xFF;
   ^
make: *** [ext/hash/hash_sha3.lo] Error 1

Test script:
---------------
in /home/user/php7 i did:

git clone https://git.php.net/repository/php-src.git

cd php-src

./buildconf

./configure \
--prefix=/usr \
--with-config-file-path=/etc \
--enable-mbstring \
--enable-zip \
--enable-bcmath \
--enable-pcntl \
--enable-ftp \
--enable-exif \
--enable-calendar \
--enable-sysvmsg \
--enable-sysvsem \
--enable-sysvshm \
--enable-wddx \
--with-curl \
--with-mcrypt \
--with-iconv \
--with-gmp \
--with-pspell \
--with-gd \
--with-jpeg-dir=/usr \
--with-png-dir=/usr \
--with-zlib-dir=/usr \
--with-xpm-dir=/usr \
--with-freetype-dir=/usr \
--with-t1lib=/usr \
--enable-gd-native-ttf \
--enable-gd-jis-conv \
--with-openssl \
--with-pdo-mysql=/usr \
--with-gettext=/usr \
--with-zlib=/usr \
--with-bz2=/usr \
--with-recode=/usr \
--with-mysqli=/usr/bin/mysql_config

then

make