Use gcc from SlapOS.

software/beremiz-runtime/buildout.hash.cfg

 [instance-profile]
 filename = instance.cfg.in
-md5sum = 0252bd3b9c6b7a74d4fb44b4ab54a830
+md5sum = 4b7e36bbb077f91cdde5a4a05502cf71

software/beremiz-runtime/instance.cfg.in

@@ -53,8 +53,8 @@ recipe = slapos.cookbook:wrapper
 # needed libraries and tools inside SlapOS context
 environment =
   BEREMIZPYTHONPATH = {{ buildout['bin-directory'] }}/pythonwitheggs
-  PATH=$PATH:/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin
-  LIBRARY_PATH=/usr/lib:/lib/x86_64-linux-gnu/:/lib:/usr/lib/x86_64-linux-gnu/:{{ openssl_location }}/lib
+  PATH={{ gcc_location }}/bin
+  LIBRARY_PATH={{ openssl_location }}/lib
 
 command-line =
  {{ buildout['bin-directory'] }}/pythonwitheggs {{ buildout['directory'] }}/parts/beremiz-source/Beremiz_cli.py -k --project-home ${directory:home}/parts/download-plc/ build transfer run

software/beremiz-runtime/software.cfg

@@ -95,8 +95,7 @@ context =
   section buildout  buildout
   raw template_monitor ${monitor2-template:output}
   key openssl_location openssl:location
-# md5sum is fetched from buildout.hash.cfg and can be recalculated automatically by
-# calling update-hash
+  key gcc_location gcc-10.2:location
 
 [versions]
 Twisted = 20.3.0