-e '/include.*malloc.h/d' \
-e 's/\([^x]\)malloc/\1xmalloc/g' \
-e 's/\([^x]\)realloc/\1xrealloc/g' \
+ -e 's/\([ \t;,(]\)free\([ \t]*[&(),]\)/\1xfree\2/g' \
+ -e 's/\([ \t;,(]\)free$$/\1xfree/g' \
-e '/^#line.*y.tab.c/d' \
< $@.tmp > $@.new
-rm $@.tmp
-e '/include.*malloc.h/d' \
-e 's/\([^x]\)malloc/\1xmalloc/g' \
-e 's/\([^x]\)realloc/\1xrealloc/g' \
+ -e 's/\([ \t;,(]\)free\([ \t]*[&(),]\)/\1xfree\2/g' \
+ -e 's/\([ \t;,(]\)free$$/\1xfree/g' \
-e 's/yy_flex_xrealloc/yyxrealloc/g' \
< $@ > $@.new && \
rm -f $@ && \