5.5p1/5.6p1 fails tests on SCO Openserver 5.0.7

[Roger Cornelius]

Openssh 5.5p1 and 5.6p1
SCO OpenServer 5.0.7

I've built various versions of openssh on SCO OSR5.0.7 over the years
without much of a problem.  Beginning with 5.5p1 however, I have been
unable to get a working install.  I'm building with gcc 2.95.3.  The
build completes normally, but 'make tests' fails on several tests:

  sftp-cmds.sh failures (get command fails on both):
  - get filename with spaces
  - get filename with glob metacharacters

  sftp-batch.sh failures:
  - bad commands

  sftp-glob.sh failures:
  - file glob
  - escaped space
  - quoted space

  cert-hostkey.sh and cert-userkey.sh failures:
  - ssh-keygen seems to generate the keys, but is unable to sign
    them, and when attempting to do so, complains:

debug3: Not a RSA1 key file /u/home/rac/src/openssh/openssh-5.6p1/regress/host_ca_key.
debug1: read PEM private key done: type RSA
debug3: Not a RSA1 key file /u/home/rac/src/openssh/openssh-5.6p1/regress/cert_host_key_rsa.
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: missing keytype
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: missing keytype
do_ca_sign: unable to open "/u/home/rac/src/openssh/openssh-5.6p1/regress/cert_host_key_rsa"
couldn't sign cert_host_key_rsa

I haven't pursued beyond this since the cert- scripts are show stoppers.
I've perused the mailing list archives and don't see anything similar.
I've also tried building without optimization on the off chance it was
something to do with gcc.

Does anyone have any suggestions?