May be it was there after installation but now I can't find it ?? netbsd10# find / -name ldconfig /etc/rc.d/ldconfig /usr/pkgsrc/audio/suil/work/.tools/bin/ldconfig /usr/pkgsrc/multimedia/cingg-netbsd/work/.tools/bin/ldconfig /usr/pkgsrc/sysutils/checkperms/work/.tools/bin/ldconfig /usr/pkgsrc/wm/enlightenment16/work/.tools/bin/ldconfig /home/guest/src/NetBSD/src/etc/rc.d/ldconfig /home/guest/src/NetBSD/src/sbin/ldconfig
NetBSD/sc is directory git cloned from github's copy of src tree. so it was supposed to be in sbin, but it does not exist there ? netbsd10# ls /sbin amrctl fsck_ext2fs mount_ffs newfs_sysvbfs rump.modstat apmlabel fsck_ffs mount_filecore newfs_udf rump.modunload atactl fsck_lfs mount_hfs newfs_v7fs rump.ping badsect fsck_msdos mount_kernfs nologin rump.ping6 bioctl fsck_udf mount_lfs npfctl rump.raidctl blkdiscard fsck_v7fs mount_mfs nvmectl rump.route blocklistctl fsdb mount_msdos pdisk rump.sysctl blocklistd fsirand mount_nfs pfctl savecore brconfig gpt mount_nilfs pflogd scan_ffs canconfig halt mount_ntfs pfs scan_lfs ccdconfig ifconfig mount_null ping scsictl cgdconfig init mount_overlay ping6 setkey chown ipf mount_portal poweroff shutdown clri iscsictl mount_procfs pppoectl slattach devpubd iscsid mount_ptyfs raidctl svhlabel dhcpcd luactl mount_puffs rcorder swapctl disklabel lvm mount_qemufwcfg rdump swapon dkctl mbrlabel mount_sysvbfs rdump_lfs sysctl dkscan_bsdlabel mknod mount_tmpfs reboot tbrconfig dmctl modload mount_udf resize_ffs ttyflags dmesg modstat mount_ufs resize_lfs tunefs dmsetup modunload mount_umap resolvconf umbctl drvctl mount mount_union restore umount dump mount_ados mount_v7fs rndctl veriexecctl dump_lfs mount_autofs mount_zfs route wdogctl fastboot mount_cd9660 newbtconf routed wsconsctl fasthalt mount_chfs newfs rrestore zfs fdiscard mount_efs newfs_ext2fs rump.cgdconfig zpool fdisk mount_ext2fs newfs_lfs rump.ifconfig fsck mount_fdesc newfs_msdos rump.modload also no /etc/ld.so.conf but man ldconfig exist ....