1 files changed, 3 insertions, 1 deletions

diff --git a/src/lib/libcrypto/bn/Makefile b/src/lib/libcrypto/bn/Makefile
index 672773454c..6dd136be5d 100644
--- a/src/lib/libcrypto/bn/Makefile
+++ b/src/lib/libcrypto/bn/Makefile
@@ -125,7 +125,9 @@ ppc-mont.s:	asm/ppc-mont.pl;$(PERL) asm/ppc-mont.pl $(PERLASM_SCHEME) $@
 ppc64-mont.s:   asm/ppc64-mont.pl;$(PERL) asm/ppc64-mont.pl $(PERLASM_SCHEME) $@
 
 alpha-mont.s:   asm/alpha-mont.pl
-        $(PERL) $< | $(CC) -E - | tee $@ > /dev/null
+        (preproc=/tmp/$$$$.$@; trap "rm $$preproc" INT; \
+        $(PERL) asm/alpha-mont.pl > $$preproc && \
+        $(CC) -E $$preproc > $@ && rm $$preproc)
 
 # GNU make "catch all"
 %-mont.s:       asm/%-mont.pl;  $(PERL) $< $(PERLASM_SCHEME) $@