as reported by Debian's OpenSSL maintainers, PostgreSQL is failing to
build against a snapshot of the upcoming 1.1.0 version. The report was
for 9.5.3, but I can reproduce it in HEAD as well:

> OpenSSL 1.1.0 is about to released.  During a rebuild of all packages using
> OpenSSL this package fail to build.  A log of that build can be found at:
> https://breakpoint.cc/openssl-1.1-rebuild-2016-05-29/Attempted/postgresql-9.5_9.5.3-1_amd64-20160529-1510
> On https://wiki.openssl.org/index.php/1.1_API_Changes you can see various of 
> the
> reasons why it might fail.  There are also updated man pages at
> https://www.openssl.org/docs/manmaster/ that should contain useful 
> information.
> There is a libssl-dev package available in experimental that contains a recent
> snapshot, I suggest you try building against that to see if everything works.

$ ./configure --with-openssl
checking for CRYPTO_new_ex_data in -lcrypto... yes
checking for SSL_library_init in -lssl... no
configure: error: library 'ssl' is required for OpenSSL

I can get one step further by tweaking configure.in and running
autoreconf, but then compilation fails further down:

-      AC_CHECK_LIB(ssl,    SSL_library_init, [], [AC_MSG_ERROR([library 'ssl' 
is required for OpenSSL])])
+      AC_CHECK_LIB([ssl],  [SSL_library_init])

make -C common all
make[4]: Verzeichnis 
„/home/cbe/projects/postgresql/pg/master/src/backend/access/common“ wird 
gcc -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement 
-Wendif-labels -Wmissing-format-attribute -Wformat-security 
-fno-strict-aliasing -fwrapv -fexcess-precision=standard -O2 
-I../../../../src/include -D_GNU_SOURCE   -c -o printtup.o printtup.c
In file included from ../../../../src/include/libpq/libpq-be.h:25:0,
                 from ../../../../src/include/libpq/libpq.h:21,
                 from printtup.c:19:
/usr/include/openssl/ssl.h:1740:26: error: expected identifier or ‘(’ before 
numeric constant
 __owur const COMP_METHOD *SSL_get_current_compression(SSL *s);


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