no refentry in acronyms.sgml?

Hi,

I just got this weird error while doing "make distprep" (doc build being
previously enabled):

osx:/pgsql/source/00head/doc/src/sgml/acronyms.sgml:3:0:E: prolog can't be omitted unless CONCUR NO and LINK EXPLICIT
NOand either IMPLYDEF ELEMENT YES or IMPLYDEF DOCTYPE YES 
osx:/pgsql/source/00head/doc/src/sgml/acronyms.sgml:3:0:E: no document type declaration; will parse without validation
Erro:  no refentry: No refentry elements found in "Acronyms".      Acronyms

I have no idea how to fix this.

--
Alvaro Herrera                                http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.