mex.h:54: error: conflicting declaration 'typedef void mxArray'

[Joe Koski]

I've been tied up finishing a paper, so I haven't done much with octave
lately. I saw John's announcement of 2.9.7, so I thought I try building it
on my Mac G5 with recently upgraded OS X 10.4.7, and Xcode tools 2.3. Xcode
2.3 has Apple's gcc-4.0.1. I have made some progress. My goal is to figure
out the Mac build problems before we see them on the octave help list.

So far, I have built the GNU version of the readline library and configure
is choosing it ahead of Apple's so-called readline.

I found I had libgcc.dylib both in /usr/lib and /usr/local/lib, so I renamed
the /usr/local/lib version. I don't know why I have both, but I suspect the
g95 and gfortran compilers required their installation at one time or
another, possibly in two locations.

I added a symbolic link pointing libgcc_s.dylib to libgcc_s.1.dylib, when
one of my attempts couldn't find -lgcc_s.

Now, when I configure with ./configure --enable-shared --disable-static
F77=gfortran

The "make -j2" build goes for 16 minutes or so, and ends with

g++ -c  -I. -I.. -I../liboctave -I../src -I../libcruft/misc  -DHAVE_CONFIG_H
-Wall -W -Wshadow -Wold-style-cast -g -O2 pager.cc -o pager.o
pager.cc: In function 'bool pager_event_handler(pid_t, int)':
pager.cc:120: warning: use of old-style cast
g++ -c  -I. -I.. -I../liboctave -I../src -I../libcruft/misc -DHAVE_CONFIG_H
-Wall -W -Wshadow -g -O2 parse.cc -o parse.o
mex.h:54: error: conflicting declaration 'typedef void mxArray'
mxarray.h:122: error: 'class mxArray' has a previous declaration as 'class
mxArray'
make[2]: *** [parse.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [src] Error 2
make: *** [all] Error 2

which looks like an actual C error rather than a build error to me. Is
gcc-4.0.1 the problem?

Any ideas?

Joe