Add Jan's reasoning for using string_rep() instead of bash based string substitutions as comment to /debian/Makefile.replaces.sh.

Main Makefile: Use absolute symlink when linking from $(X2GOLIBDIR) into $(NXLIBDIR) (i.e. linking x2goagent -> nxagent). (Fixes: #143).

Work-in patch from Jan Engehardt for working around different improper bash implementations of string-in-string replacing. (Fixes: #145).

Avoid building of libxcomp1 (which actually is identical to libxcomp3, just with a wrong name). (Fixes: #104).

Continue Reinhard's work on top-level install/uninstall. Esp. integrate debian/post-nx-build.sh into main Makefile. Make value of CONFIGURE variable traversable through the Makefile tree.

fix lintian: missing-separator-between-items in x2goagent depends field between nxagent (>= ${source:Version}) and ${misc:Depends}

No longer add them as quilt patch, as they are much easier to edit this
way. This, of course, requires adjustments to the roll-tarballs.sh script

The closes syntax is meant for Debian bugs. This avoids a lintian
warning during package build.

Add an explicit dependency from the NX libX11.so to the nxcomp
libraries. Unbreaks parallel builds.

the symlink libXcompext.so.3 was not installed correctly.

Spotted by Orion Poplawski orion@cora.nwra.com

it is automatically generated and clean during the package build

instead, clean stale configure files programatically from the clean rule
in debian/rules.

Instead, place the makefile into debian/Makefile.nx-libs. This makes the
makefile easier to edit.

This change makes debian/rules a bit easier to read

If stricter dependencies are really required, they should absolutely be
specified in the shlibs file instead.

It seems that there is a race condition in the implementation of the
nx-x11 makefiles somewhere. On machines with many cores and high levels
of parallel workers (for me, 32 cores and -j20), nxcompext gets built
before libNX_X11 is ready:

+ ln -s ../../lib/X11/libNX_X11.so .
/usr/bin/ld: cannot find -lNX_X11
collect2: error: ld returned 1 exit status
make[9]: *** [libXcompext.so.3.5.0] Fehler 1
make[9]: Leaving directory `/srv/scratch/tartler/nx-libs/nxcompext'

Until those makefiles get fixed, better disable parallel operation

The Debian xterm package depends on xbitmaps.  This change allows
compiling on a host that has xterm installed.

According to lintian, this is a severe error. Demote to recommends to
ensure that it still gets installed by default.