New comment by st3r4g on void-packages repository

https://github.com/void-linux/void-packages/pull/31549#issuecomment-872935639

Comment:
```
Starting program: /builddir/pipewire-0.3.31/build/test/test-pwtest 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib64/libthread_db.so.1".
[Detaching after fork from child process 9045]

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7dae371 in __GI__IO_fwrite (buf=buf@entry=0x555555559053, size=size@entry=1, count=count@entry=7, fp=fp@entry=0x0) at iofwrite.c:37
37	iofwrite.c: No such file or directory.
(gdb) bt
#0  0x00007ffff7dae371 in __GI__IO_fwrite (buf=buf@entry=0x555555559053, size=size@entry=1, count=count@entry=7, fp=fp@entry=0x0) at iofwrite.c:37
#1  0x00005555555581f2 in fprintf (__fmt=0x555555559053 "pwtest\n", __stream=0x0) at /usr/include/bits/stdio2.h:103
#2  make_xdg_runtime_dir () at ../test/pwtest.c:1077
#3  0x00005555555566e2 in main (argc=<optimized out>, argv=<optimized out>) at ../test/pwtest.c:1271
(gdb) f 2
#2  make_xdg_runtime_dir () at ../test/pwtest.c:1077
1077		fprintf(fp, "pwtest\n");
(gdb) l
1072		/* Marker file to avoid removing a random directory during cleanup */
1073		r = spa_scnprintf(path, sizeof(path), "%s/pwtest.dir", dir);
1074		spa_assert((size_t)r == strlen(dir) + 11);
1075		fp = fopen(path, "w");
1076		spa_assert(fp);
1077		fprintf(fp, "pwtest\n");
1078		fclose(fp);
1079	
1080		return dir;
1081	}
(gdb) p fp
$1 = (FILE *) 0x0
(gdb) p path
$2 = "/tmp/pwtest-11:35-XXXXXX/pwtest.dir", '\000' <repeats 230 times>...
(gdb) p dir
$3 = 0x55555555da20 "/tmp/pwtest-11:35-XXXXXX"
```
`mkdtemp` doesn't work in the build environment?