[Gm2] Build failure with gm2-6.4.0-20180130 mc on Solaris 10/sparc

[john o goyo]

Greetings:

The latest tarball (20180130) builds fine until it reaches 
gm2/boot-bin/mc.  LDFLAGS are not passed down to the gm2 build.

/home/build/gcc/5.2.0/bin/gcc -g -o gm2/boot-bin/mc \
[...]
gm2/mc-boot-ch/Gerrno.o gm2/mc-boot/main.o mcflex.o -lm -lpth
Undefined                       first referenced
symbol                             in file
recv                                /usr/local/lib/libpth.so
accept                              /usr/local/lib/libpth.so
sendto                              /usr/local/lib/libpth.so
getsockopt                          /usr/local/lib/libpth.so
connect                             /usr/local/lib/libpth.so
recvfrom                            /usr/local/lib/libpth.so
ld: fatal: symbol referencing errors. No output written to gm2/boot-bin/mc

Here LDFLAGS="-lnsl -lsocket -lpthread".  It appears in the gcc Makefile 
but the options do not appear in gm2.

Please advise.

Sincerely,
john