libX11's libXcursor dlopen

hello,

I spent two days now on tracking down a few problems I have with a fresh install of NetBSD 10.1_STABLE. this is my first install of NetBSD so please excuse my confusion.
The problem I would like to tackle in this mail is related to libX11 and it's interaction to libXcursor.

Upon install I quickly realized that mouse cursor settings are not getting applied to windowmaker. I got the following in my .Xresources:

Xcursor.theme: Adwaita
Xcursor.size: 48

these settings come into play when an application calls XCreateFontCursor() (part of Xlib / libX11) which in turn calls XCreateGlyphCursor() which according to

/usr/xsrc/external/mit/libX11/dist/src/CrGlCur.c

dlopens() "libXcursor.so". note the lack of version. (in the original code it searches for .1) [1]


on my system however I see this:

24472  24472 example  CALL  open(0x7f7fff2a4618,0,6)
24472  24472 example  NAMI  "/usr/X11R7/lib/libXcursor.so.2"
24472  24472 example  RET   open 4

where does that query for version '2' of the library come from? simply compiling /usr/xsrc/external/mit/libXcursor/dist results in library version '1.0'.

for some reason this version 2 does not care about xcursor sizes or themes.
if however I install libXcursor-1.2.3 from packages and force it to be used via /etc/ld.so.conf reordering and a strategic symlink then the size and theme settings are applied.

I'm using [2] as a test program. it requires adwaita-icon-theme and libXcursor installed.

to sumarise
1. why is /usr/X11R7/lib/libX11.so loading libXcursor.so.2 instead of libXcursor.so as per the sourcecode?
2. is it normal for a NetBSD system to not even have a /etc/ld.so.conf file? I might have managed to lose it during the sysupgrade ...
3. is the xsrc set out-of-sync compared to the x11 set? they were both initially installed then sysupgrade was run.
4. where can I find the sources for that elusive libXcursor.so.2 that comes with the x11 set?

[1] https://github.com/mirror/libX11/blob/ff8706a5eae25b8bafce300527079f68a201d27f/src/CrGlCur.c#L58
[2] https://pastebin.com/AZe636JK

thank you.
peter