FreeFileSync is a great open source file synchronization tool. However, despite its open source nature, there is no build instruction for it.
This repo records my own way of building FreeFileSync on Raspberry Pi with Raspbian Feb 2020 installed.
As of writing, the latest version of FreeFileSync is 10.25 and it can be downloaded from:
https://freefilesync.org/download/FreeFileSync_10.25_Source.zip.
Note wget DOES NOT work with this URL on the first try. You can either manually download it, or try wget a second time to get the source code downloaded.
The following dependencies need to be installed to make code compile.
- libgtk2.0-dev
- libxtst-dev
sudo apt-get update
sudo apt-get install ibgtk2.0-dev
sudo apt-get install libxtst-dev
The following dependencies could not be installed from apt-get command and has to be compiled from source code.
FreeFileSync requires a c++ compiler that supports c++2a. The default version of gcc with Raspbian February 2020 is 8.3.0 and does not work.
I followed the instruction at: https://www.raspberrypi.org/forums/viewtopic.php?t=239609 to build and install the gcc 10.1.0 with minor modifications. See build_gcc.sh for the script with only c/c++ languages enabled. But first change the config in build_gcc.sh according to your device (default: Raspberry Pi 4).
Note the build needs about 8 GB of free space and takes about 4 hours on the Raspberry Pi 4 (4 GB), over 6 hours on the Raspberry Pi 3B+ and over 50 hours on the Raspberry Pi Zero.
sudo chmod +x build_gcc.sh
sudo bash build_gcc.sh
If you follow the steps correctly, you should see the new verison of g++ using "g++ -v":
pi@raspberrypi:~/Downloads/FreeFileSync_10.25/FreeFileSync/Source $ g++ --version
g++ (GCC) 10.1.0
FreeFileSYnc 10.22 requires openssl version to be 0x1010105fL above, otherwise you got error:
../../zen/open_ssl.cpp:21:38: error: static assertion failed: OpenSSL version too old
21 | static_assert(OPENSSL_VERSION_NUMBER >= 0x1010105fL, "OpenSSL version too old");
Tried openssl-1.1.1f but got another error:
../../zen/open_ssl.cpp:576:68: error: 'SSL_R_UNEXPECTED_EOF_WHILE_READING' was not declared in this scope
576 | if (sslError == SSL_ERROR_SSL && ERR_GET_REASON(ec) == SSL_R_UNEXPECTED_EOF_WHILE_READING) //EOF: only expected for HTTP/1.0
So has to go with the latest openssl 3 from github:
git clone git://git.openssl.org/openssl.git --depth 1
cd openssl
./config
make
sudo make install
System provided version 1.8.0-2.1 does not work with macro not found:
LIBSSH2_ERROR_CHANNEL_WINDOW_FULL
Has to build from source:
wget https://www.libssh2.org/download/libssh2-1.9.0.tar.gz
tar xvf libssh2-1.9.0.tar.gz
cd libssh2-1.9.0/
mkdir build
cd build/
../configure
make
sudo make install
Could not get any package from apt-get working so had to build from source.
wget https://curl.haxx.se/download/curl-7.69.1.zip
unzip curl-7.69.1.zip
cd curl-7.69.1/
mkdir build
cd build/
../configure
make
sudo make install
The latest version compiles without problem:
wget https://github.com/wxWidgets/wxWidgets/releases/download/v3.1.3/wxWidgets-3.1.3.tar.bz2
tar xvf wxWidgets-3.1.3.tar.bz2
cd wxWidgets-3.1.3/
mkdir gtk-build
cd gtk-build/
../configure --disable-shared --enable-unicode
make
sudo make install
Even with the latest dependencies, there is still some comiplation errors which needs to tweat the code to fix.
add at line 58
#define MAX_SFTP_OUTGOING_SIZE 30000
#define MAX_SFTP_READ_SIZE 30000
Change some function definitions to avoid compliation error with function not found:
Replace: using EvpToBioFunc = int (*)(BIO* bio, EVP_PKEY* evp);
With: using EvpToBioFunc = int (*)(BIO* bio, const EVP_PKEY* evp);
---
Replace: int PEM_write_bio_PrivateKey2(BIO* bio, EVP_PKEY* key)
With: int PEM_write_bio_PrivateKey2(BIO* bio, const EVP_PKEY* key)
To make the exectuable easier to run, add after line 28:
LINKFLAGS += -Wl,-rpath -Wl,\$$ORIGIN
Run make in folder FreeFileSync_10.25_Source/FreeFileSync/Source.
The binary should be waiting for you in FreeFileSync_10.25_Source/FreeFileSync/Build/Bin.
After the executable is binary, copy all dependencies libraries to the same folder as the binary, the copy Build/Resources folder, zip them in a file.
Then end zip file should look like this:
Archive: FreeFileSync_10.25_armv7l.zip
Length Date Time Name
--------- ---------- ----- ----
0 2020-04-27 22:38 Bin/
9074216 2020-04-27 22:35 Bin/FreeFileSync_armv7l
560412 2020-04-17 13:40 Bin/libssl.so.3
17574572 2020-04-10 15:12 Bin/libstdc++.so.6
492832 2020-04-17 14:14 Bin/libcurl.so.4
7543332 2020-04-10 15:10 Bin/libgcc_s.so.1
3476740 2020-04-17 13:40 Bin/libcrypto.so.3
961484 2020-04-17 14:07 Bin/libssh2.so.1
349 2020-03-18 21:57 FreeFileSync.desktop
0 2020-03-18 21:57 Resources/
234 2020-03-18 21:57 Resources/Gtk3Styles.css
12402 2020-03-18 21:57 Resources/RealTimeSync.png
182060 2020-03-18 21:57 Resources/harp.wav
87678 2020-03-18 21:57 Resources/bell2.wav
13232 2020-03-18 21:57 Resources/FreeFileSync.png
223687 2020-03-18 21:57 Resources/cacert.pem
440 2020-03-18 21:57 Resources/Gtk2Styles.rc
67340 2020-03-18 21:57 Resources/ding.wav
143370 2020-03-18 21:57 Resources/bell.wav
230274 2020-03-18 21:57 Resources/gong.wav
388959 2020-03-18 21:57 Resources/Icons.zip
522150 2020-03-18 21:57 Resources/Languages.zip
55006 2020-03-18 21:57 Resources/notify.wav
Now the zip file should contain all the dependencies and the binary Bin/FreeFileSync_armv7l is able to run on a new raspberry pi with Raspbian OS directly.
Go to FreeFileSync_10.25_Source/FreeFileSync/Build/Bin:
./FreeFileSync_armv7l
You don't need to build anything again. Just copy your created FreeFileSync_10.25_armv7l.zip to the other device and follow these steps:
extract to:
/home/pi/Desktop/FFS_10.25_ARM/
sudo cp /home/pi/Desktop/FFS_10.25_ARM/Bin/lib* /usr/lib
sudo ldconfig
Go to /home/pi/Desktop/FFS_10.25_ARM/Bin/
./FreeFileSync_armv7l
../../zen/legacy_compiler.h:10:14: fatal error: numbers: No such file or directory 10 | #include //C++20
For FreeFileSync 10.25 you need gcc 10.1. gcc 9.3 will give you this error.
./FreeFileSync_armv7l: error while loading shared libraries: libssl.so.3: cannot open shared object file: No such file or directory
sudo cp /home/pi/Desktop/FFS_10.25_ARM/Bin/lib* /usr/lib
sudo ldconfig