pgadmin3 1.22.2 does not compile with GCC 7

Hello,

I want to compile pgadmin3 1.22.2 in its most current git state (REL-1_22_0-27-g794527d) using gcc 7.0.0 20160617 (experimental).

I installed wxWidgets-3.0.git (WX_3_0_BRANCH current), ./configure'd with --enable-plugins --enable-stl --enable-utf8 --with-x .

For pgadmin I `./configure --enable-databasedesigner --with-openssl --with-wx-version=3.1` which provides this summary:

PostgreSQL directory: /usr/local
PostgreSQL pg_config binary: /usr/local/bin/pg_config
PostgreSQL version: PostgreSQL 9.5.3

PostgreSQL PQconninfoParse support: Present
PostgreSQL SSL support: Missing

wxWidgets directory: /usr/local
wxWidgets wx-config binary: /usr/local/bin/wx-config
wxWidgets version: wxWidgets 3.1.0

libxml2 directory: /usr/local
libxml2 xml2-config binary: /usr/local/bin/xml2-config
libxml2 version: libxml2 2.9.3

libxslt directory: /usr/local
libxslt xslt-config binary: /usr/local/bin/xslt-config
libxslt version: libxslt 1.1.28

Building Database Designer: Yes

Building SSH Tunnel: Yes
Crypto library: OpenSSL
libz compression: yes

Building a debug version of pgAdmin: No
Statically linking pgAdmin: No
Building a Mac OS X appbundle: No

sphinx-build executable: /usr/local/bin/sphinx-build

Then doing `make -k` the compilation fails with the messages, listed at http://mail.aegee.org/dpa/pgadmin3/. It fails even, when I use gcc 6 .

Any ideas how to fix this?

Kind regards
Dilian