>> $ uname -a
>> SunOS lserver4 5.10 Generic_137138-09 i86pc i386 i86pc
> Can you take new sources ("screen-v4" git-branch) and test it again?

Sorry, I cannot.  Those SunOS machines are long gone.

screen version 4.0.3 fails to build. 
Here is the relevant output:

$ uname -a
SunOS lserver4 5.10 Generic_137138-09 i86pc i386 i86pc
$ wget 'http://ftp.gnu.org/gnu/screen/screen-4.0.3.tar.gz'
$ gunzip -c screen-4.0.3.tar.gz | tar -xvf -
$ cd screen-4.0.3
$ ./configure
$ make
CPP="gcc -E " srcdir=. sh ./osdef.sh
AWK=nawk CC="gcc -g -O2" srcdir=. sh ./comm.sh
AWK=nawk srcdir=. sh ./term.sh
gcc -c -I. -I.    -g -O2 screen.c
gcc -c -I. -I.    -g -O2 ansi.c
gcc -c -I. -I.    -g -O2 fileio.c
gcc -c -I. -I.    -g -O2 mark.c
gcc -c -I. -I.    -g -O2 misc.c
misc.c: In function `xsetenv':
misc.c:619: error: too few arguments to function `setenv'
make: * [misc.o] Error 1



-J_Tom_Moon_79