LinuxQuestions.org - trouble faxing

I just recently added a RH9 partition to my Win98 Dell, so now I have a dual boot system. I am tryinig to learn how to fax. I have a fax modem installed on the machine, and it works under Win98. But I'm having some trouble with faxing from Linux.

I want to fax a one-line document called faxtest.ps. Near as I can tell, efax and efix came as part of my RH9 distro.

So in a terminal window, I type fax send xxx-xxxx faxtest.ps

I get this error message:

/usr/bin/efax: Thu Nov 13 20:57:40 2003 efax v 0.9 Copyright 1999 Ed Casas
efax: 57:40 compiled Jan 24 2003 18:39:23
efax: 57:40 TIFF version 4.2 file (little-endian)
efax: 57:40 TIFF directory at 8 with 20 tags, last image.
efax: 57:40 page 1 : faxtest.ps.001 + 338 : 1728x2156 @ 204x196 dpi TIFF/FAX
efax: 57:40 argv[0]=/usr/bin/efax
efax: 57:40 argv[1]=-v
efax: 57:40 argv[2]=ewin
efax: 57:40 argv[3]=-v
efax: 57:40 argv[4]=chewmainrxtf
efax: 57:40 argv[5]=-d/dev/modem
efax: 57:40 argv[6]=-x
efax: 57:40 argv[7]=/var/lock/LCK..modem
efax: 57:40 argv[8]=-iZ
efax: 57:40 argv[9]=-i&FE&D2S7=120
efax: 57:40 argv[10]=-i&C0
efax: 57:40 argv[11]=-iM1L0
efax: 57:40 argv[12]=-l
efax: 57:40 argv[13]=+0 000 000 0000
efax: 57:40 argv[14]=-kZ
efax: 57:40 argv[15]=-h
efax: 57:40 argv[16]=2003/11/13 20:57 +0 000 000 0000 from a Red Hat Linux system p. %d/%d
efax: 57:40 argv[17]=-t
efax: 57:40 argv[18]=T763-5553
efax: 57:40 argv[19]=faxtest.ps.001
efax: 57:40 Error: can't open pre-lock file /var/lock/TMP..03587: Permission denied
efax: 57:40 failed -> faxtest.ps.001
efax: 57:40 done, returning 2 (unrecoverable error)

What am I doing wrong?

Thanks.