To be upstreamable, this patch requires check for *_FOR_BUILD, otherwise
it needs to pass special variables.

It would be nice to implement per-target compiler specification to
automake, as it is done for linker.

Even better it would be nice to implement native build time targets in
automake.

Index: pcre-7.6/Makefile.am
===================================================================
--- pcre-7.6.orig/Makefile.am	2008-01-23 17:58:28.000000000 +0000
+++ pcre-7.6/Makefile.am	2008-04-03 22:32:00.000000000 +0000
@@ -147,6 +147,11 @@
 
 noinst_PROGRAMS += dftables
 dftables_SOURCES = dftables.c
+dftables_LINK = $(LINK_FOR_BUILD) -o $@
+dftables_LDFLAGS = $(LDFLAGS_FOR_BUILD)
+
+dftables.o: $(srcdir)/dftables.c
+	$(CC_FOR_BUILD) -c $(CFLAGS_FOR_BUILD) -o $@ $(srcdir)/dftables.c
 
 pcre_chartables.c: dftables$(EXEEXT)
 	./dftables$(EXEEXT) $@