Description:
------------
I'm not sure if it's "on FreeBSD 11 in general" or "with my specific FreeBSD configuration", but I had a hell of a time trying to get PHP 7.1.8 to compile from git due to some issues with the build script.

For confirmation:

git clone ...; cd php-src;
./buildconf
./configure '--with-layout=GNU' '--localstatedir=/var' '--with-config-file-scan-dir=/usr/local/etc/php' '--disable-all' '--enable-libxml' '--enable-mysqlnd' '--with-libxml-dir=/usr/local' '--with-pcre-regex=/usr/local' '--program-prefix=' '--enable-fpm' '--with-fpm-user=www' '--with-fpm-group=www' '--enable-dtrace' '--prefix=/usr/local' '--mandir=/usr/local/man' '--infodir=/usr/local/info/' '--build=amd64-portbld-freebsd11.0' 'build_alias=amd64-portbld-freebsd11.0' 'CFLAGS=-O2 -pipe -fstack-protector -fno-strict-aliasing -g -march=native' 'CPPFLAGS=' 'CPP=cpp'
make -jN

This would fail on libtool invocation with seemingly nonsensical errors, some of which are reproduced below, starting with the initial failure:

--- ext/date/lib/tm2unixtime.lo ---
/usr/home/mqudsi/php-src/libtool: X--mode=compile: not found
--- ext/spl/spl_directory.lo ---
/usr/home/mqudsi/php-src/libtool: X--mode=compile: not found
--- ext/spl/spl_functions.lo ---
/usr/home/mqudsi/php-src/libtool: X--mode=compile: not found
--- ext/date/lib/dow.lo ---
/usr/home/mqudsi/php-src/libtool: X--mode=compile: not found
--- ext/date/lib/tm2unixtime.lo ---
/usr/home/mqudsi/php-src/libtool: *** Warning: inferring the mode of operation is deprecated.: not found
--- ext/date/lib/parse_iso_intervals.lo ---

this goes on for a while for each invocation of libtool. As you can see, it's a seemingly incomplete error message `: not found` without specifying _what_ wasn't found.

Then we get errors for all the CFLAGS that were passed in to ./configure:


/usr/home/mqudsi/php-src/libtool: X-DZEND_ENABLE_STATIC_TSRMLS_CACHE=1: not found
--- ext/date/lib/parse_iso_intervals.lo ---

/usr/home/mqudsi/php-src/libtool: Xcc: not found
--- ext/date/lib/parse_tz.lo ---
/usr/home/mqudsi/php-src/libtool: *** Future versions of Libtool will require --mode=MODE be specified.: not found
--- ext/standard/crypt_sha512.lo ---
/usr/home/mqudsi/php-src/libtool: *** Warning: inferring the mode of operation is deprecated.: not found
--- ext/spl/spl_array.lo ---
/usr/home/mqudsi/php-src/libtool: X-DZEND_ENABLE_STATIC_TSRMLS_CACHE=1: not found
--- ext/spl/spl_functions.lo ---
/usr/home/mqudsi/php-src/libtool: X-Iext/spl/: not found
--- ext/spl/spl_dllist.lo ---
/usr/home/mqudsi/php-src/libtool: *** Warning: inferring the mode of operation is deprecated.: not found
--- ext/spl/spl_observer.lo ---
/usr/home/mqudsi/php-src/libtool: X-DZEND_ENABLE_STATIC_TSRMLS_CACHE=1: not found
--- ext/spl/spl_heap.lo ---
/usr/home/mqudsi/php-src/libtool: *** Future versions of Libtool will require --mode=MODE be specified.: not found
--- ext/standard/crypt_sha512.lo ---
/usr/home/mqudsi/php-src/libtool: *** Future versions of Libtool will require --mode=MODE be specified.: not found
--- ext/date/lib/tm2unixtime.lo ---
/usr/home/mqudsi/php-src/libtool: X-DHAVE_TIMELIB_CONFIG_H=1: not found
--- ext/date/lib/parse_date.lo ---
/usr/home/mqudsi/php-src/libtool: *** Future versions of Libtool will require --mode=MODE be specified.: not found
--- ext/spl/spl_directory.lo ---
/usr/home/mqudsi/php-src/libtool: X-Iext/spl/: not found
--- ext/standard/browscap.lo ---
/usr/home/mqudsi/php-src/libtool: Xcc: not found
--- ext/standard/crypt_sha256.lo ---
/usr/home/mqudsi/php-src/libtool: Xcc: not found
--- ext/date/lib/parse_iso_intervals.lo ---
/usr/home/mqudsi/php-src/libtool: X-Iext/date/lib: not found
--- ext/spl/php_spl.lo ---
/usr/home/mqudsi/php-src/libtool: *** Future versions of Libtool will require --mode=MODE be specified.: not found
--- ext/libxml/libxml.lo ---
/usr/home/mqudsi/php-src/libtool: X-DZEND_ENABLE_STATIC_TSRMLS_CACHE=1: not found
--- ext/standard/base64.lo ---
/usr/home/mqudsi/php-src/libtool: *** Warning: inferring the mode of operation is deprecated.: not found
--- ext/date/lib/unixtime2tm.lo ---
/usr/home/mqudsi/php-src/libtool: X-Iext/date/lib: not found
--- ext/standard/php_crypt_r.lo ---
/usr/home/mqudsi/php-src/libtool: X-Iext/standard/: not found
--- ext/spl/spl_functions.lo ---
/usr/home/mqudsi/php-src/libtool: X-I/usr/home/mqudsi/php-src/ext/spl/: not found
--- ext/spl/spl_exceptions.lo ---
/usr/home/mqudsi/php-src/libtool: *** Future versions of Libtool will require --mode=MODE be specified.: not found
--- ext/standard/array.lo ---
/usr/home/mqudsi/php-src/libtool: *** Warning: inferring the mode of operation is deprecated.: not found
--- ext/spl/spl_iterators.lo ---
/usr/home/mqudsi/php-src/libtool: X-DZEND_ENABLE_STATIC_TSRMLS_CACHE=1: not found
--- ext/standard/crypt_freesec.lo ---
/usr/home/mqudsi/php-src/libtool: *** Warning: inferring the mode of operation is deprecated.: not found
--- ext/spl/spl_engine.lo ---
/usr/home/mqudsi/php-src/libtool: X-DZEND_ENABLE_STATIC_TSRMLS_CACHE=1: not found
--- ext/date/php_date.lo ---
/usr/home/mqudsi/php-src/libtool: X-Iext/date/lib: not found
--- ext/pcre/php_pcre.lo ---
/usr/home/mqudsi/php-src/libtool: X-DZEND_ENABLE_STATIC_TSRMLS_CACHE=1: not found
--- ext/standard/crypt_sha512.lo ---
/usr/home/mqudsi/php-src/libtool: Xcc: not found
--- ext/spl/spl_dllist.lo ---
/usr/home/mqudsi/php-src/libtool: *** Future versions of Libtool will require --mode=MODE be specified.: not found
--- ext/date/lib/interval.lo ---
/usr/home/mqudsi/php-src/libtool: X-Iext/date/lib: not found
--- ext/date/lib/timelib.lo ---
/usr/home/mqudsi/php-src/libtool: X-Iext/date/lib: not found
--- ext/standard/crypt_blowfish.lo ---
/usr/home/mqudsi/php-src/libtool: X-Iext/standard/: not found
--- ext/date/lib/astro.lo ---
/usr/home/mqudsi/php-src/libtool: X-Iext/date/lib: not found
--- ext/date/lib/parse_date.lo ---
/usr/home/mqudsi/php-src/libtool: Xcc: not found
--- ext/spl/spl_fixedarray.lo ---
/usr/home/mqudsi/php-src/libtool: X-DZEND_ENABLE_STATIC_TSRMLS_CACHE=1: not found
--- ext/spl/spl_observer.lo ---
/usr/home/mqudsi/php-src/libtool: X-Iext/spl/: not found
--- ext/date/lib/parse_tz.lo ---
/usr/home/mqudsi/php-src/libtool: Xcc: not found
--- ext/date/lib/tm2unixtime.lo ---
/usr/home/mqudsi/php-src/libtool: X-Iext/date/: not found
--- ext/date/lib/dow.lo ---
/usr/home/mqudsi/php-src/libtool: X-DZEND_ENABLE_STATIC_TSRMLS_CACHE=1: not found
--- ext/spl/spl_heap.lo ---
/usr/home/mqudsi/php-src/libtool: Xcc: not found
--- ext/standard/crypt_freesec.lo ---
/usr/home/mqudsi/php-src/libtool: *** Future versions of Libtool will require --mode=MODE be specified.: not found
--- ext/reflection/php_reflection.lo ---
/usr/home/mqudsi/php-src/libtool: X-DZEND_ENABLE_STATIC_TSRMLS_CACHE=1: not found
--- ext/spl/spl_array.lo ---
/usr/home/mqudsi/php-src/libtool: X-Iext/spl/: not found
--- ext/standard/array.lo ---
/usr/home/mqudsi/php-src/libtool: *** Future versions of Libtool will require --mode=MODE be specified.: not found
--- ext/standard/crypt_blowfish.lo ---
/usr/home/mqudsi/php-src/libtool: X-I/usr/home/mqudsi/php-src/ext/standard/: not found
--- ext/standard/php_crypt_r.lo ---
/usr/home/mqudsi/php-src/libtool: X-I/usr/home/mqudsi/php-src/ext/standard/: not found
--- ext/standard/base64.lo ---
/usr/home/mqudsi/php-src/libtool: *** Future versions of Libtool will require --mode=MODE be specified.: not found
--- ext/pcre/php_pcre.lo ---
/usr/home/mqudsi/php-src/libtool: X-Iext/pcre/: not found
--- ext/standard/array.lo ---
/usr/home/mqudsi/php-src/libtool: Xcc: not found
--- ext/spl/php_spl.lo ---
/usr/home/mqudsi/php-src/libtool: Xcc: not found
--- ext/date/php_date.lo ---
/usr/home/mqudsi/php-src/libtool: X-DZEND_ENABLE_STATIC_TSRMLS_CACHE=1: not found
--- ext/spl/spl_engine.lo ---
/usr/home/mqudsi/php-src/libtool: X-Iext/spl/: not found
--- ext/standard/crypt_freesec.lo ---
/usr/home/mqudsi/php-src/libtool: Xcc: not found
--- ext/libxml/libxml.lo ---
/usr/home/mqudsi/php-src/libtool: X-Iext/libxml/: not found
--- ext/standard/browscap.lo ---
/usr/home/mqudsi/php-src/libtool: X-DZEND_ENABLE_STATIC_TSRMLS_CACHE=1: not found
--- ext/date/lib/interval.lo ---
/usr/home/mqudsi/php-src/libtool: X-DZEND_ENABLE_STATIC_TSRMLS_CACHE=1: not found
--- ext/spl/spl_observer.lo ---
/usr/home/mqudsi/php-src/libtool: X-I/usr/home/mqudsi/php-src/ext/spl/: not found
--- ext/standard/crypt_sha256.lo ---
/usr/home/mqudsi/php-src/libtool: X-Iext/standard/: not found
--- ext/spl/spl_iterators.lo ---
/usr/home/mqudsi/php-src/libtool: X-Iext/spl/: not found
--- ext/date/lib/parse_iso_intervals.lo ---
/usr/home/mqudsi/php-src/libtool: X-DZEND_ENABLE_STATIC_TSRMLS_CACHE=1: not found
--- ext/spl/spl_dllist.lo ---
/usr/home/mqudsi/php-src/libtool: Xcc: not found
--- ext/date/lib/dow.lo ---
/usr/home/mqudsi/php-src/libtool: X-DHAVE_TIMELIB_CONFIG_H=1: not found


and so on and so forth.


This happens with both `make` and `gmake` under FreeBSD 11.1. The solution was to first 

export echo=echo


and then attempt the configure and build once more.


If it matters (since echo is normally a shell builtin), I'm using fish as my shell.