Compilation error in Debian 9

[ssinyagin]

Under Debian 9.1, something is wrong with OpenSSL headers:

Package: openssl                         
Version: 1.1.0f-3+deb9u1
State: installed

"make" output at the time of the error:

g++ -c -m64 -pipe -fstack-protector-all -D_FORTIFY_SOURCE=2 -Wl,-z,relro -Wl,-z,now -O2 -D_REENTRANT -fdiagnostics-show-option -Wall -Wextra -Wno-ignored-qualifiers -Wformat -Wformat-security -Wno-unused-parameter -Wstack-protector -fPIC -DQT_GUI -DBOOST_THREAD_USE_LIB -DBOOST_SPIRIT_THREADSAFE -DQT_DISABLE_DEPRECATED_BEFORE=0 -DUSE_UPNP=1 -DSTATICLIB -DUSE_DBUS -DHAVE_BUILD_INFO -DLINUX -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_DBUS_LIB -DQT_CORE_LIB -Isrc -Isrc/json -Isrc/qt -Isrc/leveldb/include -Isrc/leveldb/helpers -isystem /usr/include/x86_64-linux-gnu/qt5 -isystem /usr/include/x86_64-linux-gnu/qt5/QtWidgets -isystem /usr/include/x86_64-linux-gnu/qt5/QtGui -isystem /usr/include/x86_64-linux-gnu/qt5/QtDBus -isystem /usr/include/x86_64-linux-gnu/qt5/QtCore -Ibuild -Ibuild -I/usr/lib/x86_64-linux-gnu/qt5/mkspecs/linux-g++-64 -o build/txdb-leveldb.o src/txdb-leveldb.cpp
In file included from src/main.h:8:0,
                 from src/kernel.h:7,
                 from src/txdb-leveldb.cpp:17:
src/bignum.h:57:24: error: invalid use of incomplete type ‘BIGNUM {aka struct bignum_st}’
 class CBigNum : public BIGNUM
                        ^~~~~~
In file included from /usr/include/openssl/bn.h:32:0,
                 from src/bignum.h:13,
                 from src/main.h:8,
                 from src/kernel.h:7,
                 from src/txdb-leveldb.cpp:17:
/usr/include/openssl/ossl_typ.h:80:16: note: forward declaration of ‘BIGNUM {aka struct bignum_st}’
 typedef struct bignum_st BIGNUM;
                ^~~~~~~~~
In file included from src/main.h:8:0,
                 from src/kernel.h:7,
                 from src/txdb-leveldb.cpp:17:
src/bignum.h: In constructor ‘CBigNum::CBigNum()’:
src/bignum.h:62:21: error: ‘BN_init’ was not declared in this scope
         BN_init(this);

(about a hundred lines of errors further down)

[dmzpkts]

Also experiencing the same build errors on debian 9 on a clean install

[dmzpkts]

May be related to this, and needing an openssl OLDER than 1.1.0 and boost 1.60

bitshares/bitshares-core#327

Looks like im setting up a ubuntu 16.04 container. This doesnt look simple.

[TheQuantumPhysicist]

This is because you're using OpenSSL 1.1.0, where Neblio uses OpenSSL 1.0.2. You have two options:

1. Compile OpenSSL 1.0.2 yourself, and link to it in neblio-qt.pro. This is a script that will do it for you. Then run qmake this way:

qmake "OPENSSL_INCLUDE_PATH=/path/to/openssl_build/include/" "OPENSSL_LIB_PATH=/path/to/openssl_build/lib/" /path/to/build/in

then make.
2. Install OpenSSL 1.0.2 on your Debian using the command sudo apt-get install libssl1.0.2. Be careful because this might break dependencies in your system, as some other programs use OpenSSL 1.1.0, and both SSL versions can't coexist. Do this only if you know what you're doing.