CMake Error / Could not find required program xxd , desktop-file validate...

[BobSynfig]

Trying to use ./build-synfigstudio.sh on Ubuntu 18.04.1 LTS
Fresh clone of the repository
Crashing during build of libappimage

-- Checking for program xxd
CMake Error at lib/libappimage/cmake/tools.cmake:37 (message):
Could not find required program xxd.
Call Stack (most recent call first):
lib/libappimage/cmake/tools.cmake:54 (check_program)
lib/libappimage/CMakeLists.txt:15 (include)

-- Configuring incomplete, errors occurred!
See also "/build/packet/linux-64/appimagekit-master/build/AppImageKit/CMakeFiles/CMakeOutput.log".

Nothing in the log file

Disabling check_program(NAME xxd) in tools.cmake , it crashes at the next line ( check_program(NAME desktop-file-validate) )

which xxd
=>
/usr/bin/xxd

which desktop-file-validate
=>
/usr/bin/desktop-file-validate

But it seems these binaries are also present in snap hierarchy, maybe it can affect the process

locate xxd
=>
/snap/core/6130/usr/bin/xxd
/snap/core/6130/usr/share/bash-completion/completions/xxd
/snap/core18/594/usr/bin/xxd
/snap/core18/594/usr/share/doc/xxd
/snap/core18/594/usr/share/doc/xxd/changelog.Debian.gz
/snap/core18/594/usr/share/doc/xxd/copyright
/usr/bin/llvm-cxxdump-6.0
/usr/bin/xxd
(...)

locate desktop-file-validate
=>
/snap/core/6130/usr/share/bash-completion/completions/desktop-file-validate
/usr/bin/desktop-file-validate
/usr/share/bash-completion/completions/desktop-file-validate
/usr/share/man/man1/desktop-file-validate.1.gz

[blackwarthog]

We need to select and freeze an Appimage vesrion, to prevent such situations.

[morevnaproject]

@blackwarthog Ah, I see - the appimagekit package is fetched from master...

[blackwarthog]

@morevnaproject, please tell your last built commit or tag of AppimageKit

[morevnaproject]

@blackwarthog
d5102de21952217e2f9d0d2119442f843e0fa4dd
2017-11-06 14:25:57
"Escape character"

[morevnaproject]

@BobSynfig I have made a fix. Can you please test if it works now?

[BobSynfig]

The script is now functionnal, but I could build only x64 appimage, after I ran out of disk space after 2.5 hours, about 10GB free in the beginning...
I'm sure we can do better to avoid the need of a "war machine" to build everything :P

[morevnaproject]

The issue synfig/synfig#666 is a key for solving this! Unfortunately, I haven't had time to work on it yet. ^__^"

Preparing for GSoC, making release and writing reports takes most of my time right now. But I hope to get at this issue soon! (I really hope ^__^")

[morevnaproject]

P.S. @BobSynfig BTW, your activity with github issues at Synfig repo is really helps a lot. Thank you for that! ^__^