can't make pdlib on Ubuntu 16.04 - #error DLIB_NO_GUI_SUPPORT is defined so you can't use the GUI code

[SlavikCA]

Tried to follow README
But make fails with this error:

root@ubhome:/home/slavik/face/pdlib# make
/bin/bash /home/slavik/face/pdlib/libtool --mode=compile g++ -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 -I. -I/home/slavik/face/pdlib -DPHP_ATOM_INC -I/home/slavik/face/pdlib/include -I/home/slavik/face/pdlib/main -I/home/slavik/face/pdlib -I/usr/include/php/20151012 -I/usr/include/php/20151012/main -I/usr/include/php/20151012/TSRM -I/usr/include/php/20151012/Zend -I/usr/include/php/20151012/ext -I/usr/include/php/20151012/ext/date/lib -I/usr/local/include  -DHAVE_CONFIG_H  -std=c++11   -c /home/slavik/face/pdlib/src/face_detection.cc -o src/face_detection.lo
libtool: compile:  g++ -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 -I. -I/home/slavik/face/pdlib -DPHP_ATOM_INC -I/home/slavik/face/pdlib/include -I/home/slavik/face/pdlib/main -I/home/slavik/face/pdlib -I/usr/include/php/20151012 -I/usr/include/php/20151012/main -I/usr/include/php/20151012/TSRM -I/usr/include/php/20151012/Zend -I/usr/include/php/20151012/ext -I/usr/include/php/20151012/ext/date/lib -I/usr/local/include -DHAVE_CONFIG_H -std=c++11 -c /home/slavik/face/pdlib/src/face_detection.cc  -fPIC -DPIC -o src/.libs/face_detection.o
In file included from /usr/local/include/dlib/gui_core/xlib.h:4:0,
                 from /usr/local/include/dlib/gui_core.h:14,
                 from /usr/local/include/dlib/gui_widgets/drawable.h:10,
                 from /usr/local/include/dlib/gui_widgets/widgets.h:16,
                 from /usr/local/include/dlib/gui_widgets.h:13,
                 from /home/slavik/face/pdlib/src/face_detection.cc:6:
/usr/local/include/dlib/gui_core/gui_core_kernel_2.h:11:2: error: #error "DLIB_NO_GUI_SUPPORT is defined so you can't use the GUI code.  Turn DLIB_NO_GUI_SUPPORT off if you want to use it."
 #error "DLIB_NO_GUI_SUPPORT is defined so you can't use the GUI code.  Turn DLIB_NO_GUI_SUPPORT off if you want to use it."
  ^
/usr/local/include/dlib/gui_core/gui_core_kernel_2.h:12:2: error: #error "Also make sure you have libx11-dev installed on your system"
 #error "Also make sure you have libx11-dev installed on your system"
  ^

And yes, I have libx11-dev installed on my system.

Any way around that issue?

Or is there pdlib.so I can download (where?) and use?

[SlavikCA]

ok, figured solutions here:
#13

I needed to install libx11-dev even before dlib...

[Snake883]

I'm having a similar issue:

/usr/local/include/dlib/gui_core/gui_core_kernel_2.h:11:2: error: #error "DLIB_NO_GUI_SUPPORT is defined so you can't use the GUI code. Turn DLIB_NO_GUI_SUPPORT off if you want to use it."
#error "DLIB_NO_GUI_SUPPORT is defined so you can't use the GUI code. Turn DLIB_NO_GUI_SUPPORT off if you want to use it."
^
/usr/local/include/dlib/gui_core/gui_core_kernel_2.h:12:2: error: #error "Also make sure you have libx11-dev installed on your system"
#error "Also make sure you have libx11-dev installed on your system"
^
Makefile:198: recipe for target 'src/face_detection.lo' failed

I'm trying to get FaceRecognition install and working on NextCloud. There's no X11 interface, only the Nextcloud WebGUI.

How do I get this to work? How do I turn DLIB_NO_GUI_SUPPORT off?

Thank you.

[stalker314314]

Take a look here, where we written installation instructions. I think, when you did ./configure, you didn't have libx11-dev, so ./configure generate makefile with DLIB_NO_GUI_SUPPORT. Try adding libx11-dev and starting ./configure again.

[stalker314314]

But...you shouldn't have to hunt installation instruction on some non-related repo:) I will try to write it in README.md (here or in fork)

[Snake883]

Thanks....finally got past the error by removing the folders dlib and pdlib and starting over.

[voarsh2]

Thanks....finally got past the error by removing the folders dlib and pdlib and starting over.

Thanks for your helpful tip!

[jimbolimbo13]

Thanks....finally got past the error by removing the folders dlib and pdlib and starting over.

Yep, that did it for me too. I suspect I didn't install libx11-dev until after building dlib the first time