Re: [Gnuplot-info] Gnuplot 5.1 Warning and Incorrect Plot

[Thomas D. D. <to...@sp...>]

I found a solution.

I was using qt4.  Building with qt5 failed at several points, due to my 
setup and system.  Configure was not generating a correct Makefile 
because it could not find qt5!  The key is to look at the Makefile, 
specifically QT_CFLAGS and QT_LIBS.  If they are blank, the problem is 
with the build dependencies.

I did a lot of things, so, not sure what fixed things, maybe all.

 > uname -a
Linux P9X79 3.13.0-51-generic #84-Ubuntu SMP Wed Apr 15 12:08:34 UTC 
2015 x86_64 x86_64 x86_64 GNU/Linux
 > lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 14.04.2 LTS
Release:        14.04
Codename:       trusty

I installed
   build-dep gnuplot
   qttools5-dev-tools
   qtbase5-dev
   libqt5svg5 libqt5svg5-dev

and, did 'sudo updatedb'.  This is very important.

Now, 'configure --with-qt=qt5' generates the correct QT_CFLAGS and 
QT_LIBS values.  Before, they were blank!

configure, make, make check, and make install all work.

The first plot is correct!

Sorry for all the noise.  Hope this helps someone else.

Tom Dean