compile with 
	make SHELL=/usr/local/bin/bash YACC="bison -y" LEX="flex -l" LIBS=" -lnetcdf -lz -ldl -lg++ -lpthread -lSM -lICE -lgen -L/usr/openwin/lib -L/usr/openwin/lib  -ldga -lXmu -lsocket -lnsl "  all


In file
	dx-4.0/include/dxconfig.h
added 
	#define MAXHOSTNAMELEN 256 
taken from /usr/include/?.
================================================================
We get the error
    make[3]: Entering directory `/a/chamberlin-1/export/home/0065/ftp/u/ma/hohn/linux/opendx/dx-4.0/src/exec/dxexec'
    gcc -DHAVE_CONFIG_H -I. -I. -I../../../include -I../dpexec -Dsolaris    -g -O2 -I/usr/openwin/include -c main.c
    gcc  -g -O2 -I/usr/openwin/include  -o dxexec  main.o ../dpexec/libDPEXEC.a 	../dxmods/libDXMODS.a 	../libdx/libLIBDX.a 	../hwrender/libHW.a 	../hwrender/opengl/libOPENGL.a 	-L/usr/X11R6/lib 	-L/usr/local/lib 	-lm -lGL -lX11 -lXext -lnetcdf -lz -ldl -lg++ -lpthread -lSM -lICE -lgen -L/usr/openwin/lib -L/usr/openwin/lib  -ldga -lXmu
    Undefined			first referenced
     symbol  			    in file
    socket                              ../dpexec/libDPEXEC.a(socket.o)  (symbol belongs to implicit dependency /usr/lib/libsocket.so.1)

Adding -lsocket gets around this.
================================================================
Similarly in 
directory `/a/chamberlin-1/export/home/0065/ftp/u/ma/hohn/linux/opendx/dx-4.0/src/ui++/dxui'

Adding -lsocket -lnsl  to LIBS (in src/ui++/dxui/Makefile) to yield
	LIBS = -lnetcdf -lz -ldl -lg++ -lpthread -lSM -lICE -lgen -L/usr/openwin/lib -L/usr/openwin/lib  -ldga -lXmu 
fixes one part of the problem.

Mixed use of lex and bison causes references to missing yyrestart();
in particular, there is the warning
	Network.C:5703: warning: implicit declaration of function `int yyrestart(...)'

switching to flex causes missing references to yylineno.


Switching to flex/bison in the make invocation fixed that.

================================================================
In src/ui++/prompter, again need -lsocket -lnsl