Build failing for PHP 7.2.0alpha2

build-failing

# make finishes with
Generating phar.php
Generating phar.phar
PEAR package PHP_Archive not installed: generated phar will require PHP's phar extension be enabled.
directorytreeiterator.inc
clicommand.inc
invertedregexiterator.inc
directorygraphiterator.inc
pharcommand.inc
phar.inc

Build complete.
Don't forget to run 'make test'.

# starting make install
+ make install
Installing shared extensions:     /usr/local/lib/php/extensions/no-debug-non-zts-20160303/
Installing PHP CLI binary:        /usr/local/bin/
Installing PHP CLI man page:      /usr/local/php/man/man1/
Installing phpdbg binary:         /usr/local/bin/
Installing phpdbg man page:       /usr/local/php/man/man1/
Installing build environment:     /usr/local/lib/php/build/
Installing header files:          /usr/local/include/php/
Installing helper programs:       /usr/local/bin/
  program: phpize
  program: php-config
Installing man pages:             /usr/local/php/man/man1/
  page: phpize.1
  page: php-config.1
Installing PEAR environment:      /usr/local/lib/php/
make[1]: *** [install-pear-installer] Error 255
Makefile:435: recipe for target 'install-pear-installer' failed
Makefile:438: recipe for target 'install-pear' failed
make: *** [install-pear] Error 2
The command '/bin/sh -c set -xe 	&& buildDeps=" 		$PHP_EXTRA_BUILD_DEPS 		libcurl4-openssl-dev 		libedit-dev 		libsqlite3-dev 		libssl-dev 		libxml2-dev 	" 	&& apt-get update && apt-get install -y $buildDeps --no-install-recommends && rm -rf /var/lib/apt/lists/* 	&& export CFLAGS="$PHP_CFLAGS" 		CPPFLAGS="$PHP_CPPFLAGS" 	LDFLAGS="$PHP_LDFLAGS" 	&& docker-php-source extract 	&& cd /usr/src/php 	&& gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)" 	&& debMultiarch="$(dpkg-architecture --query DEB_BUILD_MULTIARCH)" 	&& ./configure 		--build="$gnuArch" 		--with-config-file-path="$PHP_INI_DIR" 		--with-config-file-scan-dir="$PHP_INI_DIR/conf.d" 		--disable-cgi 		--enable-ftp 		--enable-mbstring 		--enable-mysqlnd 		--with-curl 		--with-libedit 		--with-openssl 		--with-zlib 		--with-pcre-regex=/usr 		--with-libdir="lib/$debMultiarch" 		$PHP_EXTRA_CONFIGURE_ARGS 	&& make -j "$(nproc)" 	&& make install 	&& { find /usr/local/bin /usr/local/sbin -type f -executable -exec strip --strip-all '{}' + || true; } 	&& cd / 	&& pecl update-channels 	&& rm -rf /tmp/pear ~/.pearrc' returned a non-zero code: 2

fix?