Imported libSDF into VOID tree

external/libsdf/GNUmakefile

@@ -0,0 +1,34 @@
+tarname:=tree19
+ARCH=x86_64
+
+# Make.$(ARCH) sets many of the variables that are then used in
+# Make.generic.  Leaving it out can cause problems, for example,
+# Make.$(ARCH) wants to redefine 'TAR'.  On the other hand, leaving
+# it in can cause problems (apparently) with older versions of GNUmake
+# because, e.g., assignements like LOADLIBES:=-foo $(LOADLIBES) get
+# 'executed' multiple times.  Once in this Makefile, and once in the
+# daughter makefiles.
+
+###include Make-common/Make.$(ARCH)
+
+# we should also go into SDFcvt, SDF2fld, commtst, lsv, lsvtst, (anything
+# else?) and build them.  Possibly under a different target?
+
+all: All
+
+# Make.generic has targets for clean, all, etc., so we need to
+# spell them a little differently in this file...
+include Make-common/Make.generic
+
+subdirs:= libSDF libmpmy
+
+All:
+	for dir in $(subdirs); do (cd $$dir; $(MAKE) ARCH=$(ARCH) all); done
+
+Depends :
+	for dir in $(subdirs); do (cd $$dir; $(MAKE) ARCH=$(ARCH) depends); done
+
+Clean : 
+	for dir in $(subdirs); do (cd $$dir; $(MAKE) ARCH=$(ARCH) clean); done
+
+# $(treedir)