Building SVN source failures: VPATH builds; Cygwin

[Hans-Bernhard Bröker]

Hello everyone,

I ran into some sizable obstacles trying to build current SVN sources of 
texinfo on Cygwin

*) A VPATH build breaks in tp/Texinfo/MiscXS/lib, because the 
sed-as-a-preprocessor mechanism _silently_ fails to include c++defs.h & 
friends into the built headers, as they don't exist in $(builddir).  I 
prepended $(srcdir)/ to the definition of CXXDEFS_H & friends to fix this.

*) After that, MiscXS still failed to build because the source is 
intolerant of a case-sensitively challenged file system: there are two 
source files named MiscXS.c and miscxs.c, which resolve to the 
effectively _same_ object file.  I really think one of the two should be 
renamed.

*) Later into the build, there's another VPATH build failure: help2man 
cannot extract help from texindex, because texindex itself is in 
$(top_builddir)/texindex, but its support files (texindex.awk, ...) are 
still only in $(top_srcdir)/texindex

See ya

Hans-Bernhard Broeker