Attributes GH PR #790: https://github.com/ArcticaProject/nx-libs/pull/790

nxcomp/src/Makefile.am: Correct usage of PTHREAD_CFLAGS and PTHREAD_LIBS. PTHREAD_CFLAGS is also supposed to be used when linking. See comments in m4/ax_pthread.m4.

Makefile: Add clean/distclean target calls for nxdialog subdir to master Makefile's clean/distclean targets.

Attributes GH PR #791: https://github.com/ArcticaProject/nx-libs/pull/791

This workaround/hack should not be needed any longer.

Should be fixed by correctly building libXcomp.

See: ArcticaProject/nx-libs#756

Find the first available pthread library and use it together with the
-pthread flag if the C compiler is set to GCC.

Fixes: ArcticaProject/nx-libs#756

Older autoconf versions - as used on SLE 11 and RHEL 6 - choke if
aclocal is passed an include directory that does not exist.

Instead of removing the option from the aclocal call, let's keep it and
just use an empty directory for now. Maybe we'll actually use it at a
later time.

debian/patches: Add 2004_enforce-lpthread.patch. On Debian, enforce -lpthread when building nxcomp. This is a nasty work around for a missing symbols issue that needs to get addressed otherwise in later release.

nx-libs.spec: Dropping nxdialog files from installation for now when building RPMs. Postponing nxdialog integration with RPM packaging for now.

Attributes GH PR #789: https://github.com/ArcticaProject/nx-libs/pull/789
Approved by Ulrich Sibiller <uli42@gmx.de>, Fri, 01 Mar 2019 05:41:23 -0800

Attributes GH PR #767: https://github.com/ArcticaProject/nx-libs/pull/767

Agent PID 0 can be used for testing

By adding NX_CLIENT=<path to nxdialog> to the envrionment
certain actions in nx will open dialogs. If the options string contains
"menu=1" rootless windows will show a popup menu when the mouse hits
the center of the title bar offering session disconnect/terminatation.

Attributes GH PR #762: https://github.com/ArcticaProject/nx-libs/pull/762

Attributes GH PR #763: https://github.com/ArcticaProject/nx-libs/pull/763

Instead of using a pragma which will be valid for the whole file this
only affects the functions where it is actually required and supresses
"format string is not a string literal" warnings.

According to GCC documentation the second attribute parameter should
be 0:

"For functions where the arguments are not available to be checked
(such as vprintf), specify the third parameter as zero".

storage class specifier is deprecated and incompatible with C++17