Hi,
We encountered a few minor issues building emacs-22.1 with GTK. On
Solaris 2.6 there is no recursive mutex support. I worried about using
pthread_getspecific/setspecific etc. to emulate recursive mutexes
because it seemed likely that these would require a malloc, and the
locks are around malloc hooks. Instead, since the only chance of
recursive behavior seemed to be realloc calling malloc/free we copied
the locking malloc and free functions, but removed the locks, and used
those for realloc on systems without recursive mutexes.

On HP-UX, emacs failed to build with GTK because hp-ux has, in its
pthread.h:
        static int pthread_create( .....
And we have #define static, so it died with multiple definitions of
pthread_create and pthread_attr_init. Removing the #define was not
enough, we got segmentation faults until we also removed the
-lpthread.

AIX-4.3.3 failed to build because abs() was #defined multiple times,
and a couple of enums ended with a comma.

Failed to build on linux with gcc-2.95 because gtkutil.c has a
variable declaration in the middle of a block.

Patch attached.

Thanks,
Peter