Investigating further, I find by looking for mmap in the output of
/sbin/sysctl an interesting setting called vm.mmap_min_addr.
$ /sbin/sysctl vm.mmap_min_addr
vm.mmap_min_addr = 4096
$ GCL_ANSI=t gclcvs
[1]16794 killed GCL_ANSI=t gclcvs
$ sudo /sbin/sysctl vm.mmap_min_addr=0
vm.mmap_min_
googling for execve sigkill, it looks like gclcvs might be trying to
map things at the wrong place in its ELF header, where "wrong" means
"not allowed to casual users".
As a user:
$ /lib/ld-linux-x86-64.so.2 --list
/usr/lib/gcl-2.7.0-prof//unixport/saved_ansi_gcl
/usr/lib/gcl-2.7.0-prof//unixport/
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