Index: /trunk/doc/release.2015/ps1.dataproducts/Makefile
===================================================================
--- /trunk/doc/release.2015/ps1.dataproducts/Makefile	(revision 41409)
+++ /trunk/doc/release.2015/ps1.dataproducts/Makefile	(revision 41410)
@@ -9,5 +9,8 @@
 
 all: pdf tgz
-journal: dataproducts.journal.tgz
+
+journal: protect_pdf dataproducts.journal.tgz
+# journal: dataproducts.journal.tgz
+
 arxiv: dataproducts.arxiv.tgz
 pdf: dataproducts.pdf
@@ -16,4 +19,12 @@
 
 BIBLIB = dataproducts.bib
+
+## this file is a little tricky: these tables and figures have been
+## embedded in wrappers with the same names as the input files.
+## if these are part of the dependency list, make tries to generate
+## the pdf from the tex files and gets in trouble
+## this can be prevented if the pdf files have newer dates than the
+## tex files.  the target 'protect_pdf' touches the PDF files to
+## force the date to be later
 
 FILES = \
@@ -52,4 +63,7 @@
 EPSPICS = 
 
+protect_pdf:
+	touch $(PDFPICS)
+
 # dataproducts.pdf: $(FILES) $(PNGPICS) $(PDFPICS)
 dataproducts.pdf: $(FILES)