Tested on NetBSD 2.0 (version 1.x used GCC 2) with FLTK 1.4 git revision b3b0512.
Compiler: GCC 3.3 (supports C99, but the system libc only has partial support).

The macro "FL_DEPRECATED" does not work.
Because there was no problem on AIX with GCC 3.4, I changed a threshold with this patch:
patch_FL_fl_attr.h.txt

The Fl_Terminal widget has a problem with "putchar()".
Looks like some header indirectly includes "stdio.h", which defines "putchar()" as a macro on this system.
POSIX defines "putchar()" as equivalent to "putc()":
https://pubs.opengroup.org/onlinepubs/9699919799/functions/putchar.html
And "putc()" is allowed to be implemented as macro:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/putc.html
The FLTK code seems to ask for "Fl_Terminal::putchar()" only.
This patch explicitly undefines the macro "putchar()":

Tested on NetBSD 9.3 (current stable version) with FLTK 1.4 git revision 4742d83.
Compiler: GCC 7.5 (system libc should be POSIX.1-2001 conformant, POSIX.1-2008 still not supported).

Can be compiled, but needs the patch from #942 too. Otherwise the mount point list in the file browser does not work.

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