+
+
+ifdef gmp-srcdir
+
+gmp-srcdir := $(firstword $(filter-out ..//%,$(..)$(gmp-srcdir) $(gmp-srcdir)))
+
+# Copy the mpn source files we use from the GNU MP source directory.
+# `gmp-srcdir' is set by doing `configure --with-gmp=DIR'.
+# (Do not try this at home. You need an as yet unreleased version of GNU MP.)
+
+mpn-sysdep := $(addsuffix .c,$(mpn-routines)) \
+ $(addsuffix .S,$(mpn-routines)) \
+ $(addsuffix .s,$(mpn-routines)) gmp-mparam.h asm-syntax.h
+
+mpn-try := $(addprefix $(gmp-srcdir)/mpn/*/,$(mpn-sysdep)) \
+ $(addprefix $(gmp-srcdir)/mpn/*/*/,$(mpn-sysdep))
+mpn-found = $(wildcard $(mpn-try))
+
+include mpn-copy.mk
+%.mk: gen-%; sh $< > $@
+
+mpn-copy-1 := $(patsubst $(gmp-srcdir)/mpn/%,$(sysdep_dir)/%,$(mpn-found))
+mpn-copy-sysdep := $(mpn-copy-sysdep) $(mpn-copy-1)
+mpn-copy-sysdep := $(filter $(addsuffix %,\
+ $(wildcard $(sort $(dir $(mpn-copy-sysdep))))), \
+ $(mpn-copy-sysdep))
+$(mpn-copy-1): $(sysdep_dir)/%: $(ignore gmp2glibc.sed) $(gmp-srcdir)/mpn/%
+ $(gmp2glibc)
+
+mpn-stuff = $(mpn-copy-sysdep) $(mpn-copy)
+
+# chmod so I don't edit them by mistake.
+define gmp2glibc
+$(ignore sed -f $^ > $@-tmp)
+cp $< $@-tmp
+chmod a-w $@-tmp
+mv -f $@-tmp $@
+endef
+
+mpn-copy = $(filter-out $(mpn-sysdep),$(mpn-headers))# mp_clz_tab.c)
+$(mpn-copy): %: $(ignore gmp2glibc.sed) $(gmp-srcdir)/%; $(gmp2glibc)
+
+.PHONY: copy-mpn clean-mpn mpn-stuff
+mpn-stuff: $(mpn-stuff)
+copy-mpn: $(mpn-stuff)
+ test ! -d CVS || cvs commit -m'Updated from $(gmp-srcdir)' $+
+clean-mpn:
+ rm -f $(mpn-stuff)
+
+endif