gistfile1.txt

$ brew install php55
==> Downloading http://www.php.net/get/php-5.5.11.tar.bz2/from/this/mirror
Already downloaded: /Library/Caches/Homebrew/php55-5.5.11
Warning: Backing up all known pear.conf and .pearrc files
Warning: If you have a pre-existing pear install outside
         of homebrew-php, or you are using a non-standard
         pear.conf location, installation may fail.
==> ./configure --prefix=/usr/local/Cellar/php55/5.5.11 --localstatedir=/usr/local/var --sysconfdir=/usr/local/etc/php/5.5 --with-config-file-path=/usr/local/etc/php/5.5 --with-config-file-scan-dir=/usr/local/etc/php/5.5/conf.d --with-iconv-dir=/usr --enable-dba --with-ndbm=/usr --enable-exif --enable-soap --enab
checking for mmap() using shm_open() shared memory support... no
checking for mmap() using regular file shared memory support... no
checking "whether flock struct is linux ordered"... "no"
checking "whether flock struct is BSD ordered"... "no"
configure: error: Don't know how to define struct flock on this system, set --enable-opcache=no

READ THIS: https://github.com/Homebrew/homebrew/wiki/troubleshooting
If reporting this issue please do so at (not Homebrew/homebrew):
  https://github.com/josegonzalez-php/homebrew-Formula/issues