would you please add file "zen/stream_buffer.h" to the source zip file?
g++-10 -std=c++2a -pipe -DWXINTL_NO_GETTEXT_MACRO -I../.. -I../../zenXml -include "zen/i18n.h" -include "zen/warn_static.h" -Wall -Wfatal-errors -Wmissing-include-dirs -Wswitch-enum -Wcast-align -Wnon-virtual-dtor -Wno-unused-function -Wshadow -Wno-maybe-uninitialized -O3 -DNDEBUG `wx-config --cxxflags --debug=no` -pthread `pkg-config --cflags openssl` `pkg-config --cflags libcurl` `pkg-config --cflags libssh2` `pkg-config --cflags gtk+-3.0` -isystem/usr/include/gtk-3.0 `pkg-config --cflags libselinux` -DHAVE_SELINUX -c afs/ftp.cpp -o /tmp/FreeFileSync_Make/ffs/src/afs/ftp.cpp.o
In file included from afs/ftp.cpp:16:
afs/abstract_impl.h:12:10: fatal error: zen/stream_buffer.h: No such file or directory
12 | #include <zen/stream_buffer.h>
| ^~~~~~~~~~~~~~~~~~~~~
compilation terminated.
make: *** [Makefile:132: /tmp/FreeFileSync_Make/ffs/src/afs/ftp.cpp.o] Error 1
make: Leaving directory '/usr/src/freefilesync/11.16-1/FreeFileSync/Source'
