bug#45611: 28.0.50; xterm.c compile anomaly and link failure

[Eli Zaretskii <eliz@gnu.org>]

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> From: William C Doughty III <n2ocm@optonline.net>
> Date: Sat, 02 Jan 2021 10:03:15 -0500
> 
> >> Needed to manually set HAVE_XRENDER and add -lXrender
> >> to src/Makefile, after this the make compiles xterm.c
> >> cleanly and the link for temacs succeeds.
> >
> > Please show the part of config.log where it tests for Xrender
> > availability.
> >
> > Thanks.
> 
> >From the config.log , at least I think that's the section.
> 
> | #define USE_XIM 1
> | #define XRegisterIMInstantiateCallback_arg6 XPointer
> | /* end confdefs.h.  */
> | #include <X11/Intrinsic.h>
> | 	 #include <X11/extensions/Xrender.h>
> | 
> | int
> | main ()
> | {
> | return !XRenderQueryExtension;
> |   ;
> |   return 0;
> | }

Yes, but please show all the rest, starting with "checking for
XRenderQueryExtension in -lXrender" and ending with "$? = ..." after
the test.  The test program is printed _after_ the stuff I want to
see, in particular the error messages that failed the compilation of
the test program.

> configure:14699: checking for cairo >= 1.8.0
> configure:14706: $PKG_CONFIG --exists --print-errors "$CAIRO_MODULE"
> configure:14709: $? = 0
> configure:14723: $PKG_CONFIG --exists --print-errors "$CAIRO_MODULE"
> configure:14726: $? = 0
> configure:14764: result

This the next test, so it is not relevant.

> The below if from the last time I tried a a compile from
> master. This is on a Fedora 32 system after :

Strange, it looks like the test for XRender was not done at all...
On my system that test is between these two:

> checking for inotify_init1... yes
> checking for cairo >= 1.8.0... yes

It says:

  checking for XRenderQueryExtension in -lXrender... yes

Why isn't that test being run on your system?